Marriage Within Relatives in Nepal: What the Law Allows and Prohibits (2026)

One of the most common legal questions couples ask before registering a court marriage in Nepal is whether their relationship falls within the prohibited degrees. Nepal's Muluki Civil Code 2074 draws clear lines about which relatives can and cannot marry — and those lines do not always match cultural expectations. Some communities in Nepal have practised cousin marriage for generations, while the law now restricts it. This guide explains exactly what the Civil Code says about marriage within relatives in Nepal, which relationships are completely prohibited, where cousin marriages stand, and what happens if you marry someone within the forbidden degrees.

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What the Civil Code 2074 Says About Prohibited Marriages

The legal framework for prohibited marriages sits within Part 3 of the Muluki Civil Code 2074, specifically Sections 67 to 84. The key provision is Section 70, which sets out four mandatory conditions for a valid marriage. The fourth condition requires that the parties are not related within the prohibited degrees of kinship.

The prohibited degrees are defined using the sapinda concept — a traditional Hindu legal term that Nepal's Civil Code has codified into statute. The sapinda relationship traces blood connections through both the paternal and maternal lines, with different limits for each:

The counting starts from the person themselves. So "7 generations on the paternal side" means: you (1), your father (2), your grandfather (3), great-grandfather (4), and so on up to the 7th ancestor. Anyone who shares that same ancestor on the paternal line falls within the prohibited relationship.

Blood Relations Completely Prohibited from Marrying

Certain blood relationships are absolutely prohibited under every interpretation of the law. These are the closest degrees of kinship, and marriage between these relatives is void — not voidable, not merely illegal, but legally non-existent.

Prohibited in All Cases

• Parent and child — including biological and adopted children
• Siblings — full siblings (same father and mother) and half-siblings (sharing one parent)
• Grandparent and grandchild — in any direct ascending/descending line
• Uncle/aunt and nephew/niece — on both paternal and maternal sides
• Great-uncle/great-aunt and great-nephew/great-niece

These prohibitions are universal across all communities, religions, and ethnicities in Nepal. No cultural practice or religious custom can override them. A marriage between any of these relatives is void under Section 70, and the court will treat it as if the marriage never took place.

For a detailed explanation of what happens when a prohibited marriage is registered, see our guide on void and voidable marriage in Nepal.

What About Cousin Marriages in Nepal?

This is where most confusion arises — and where cultural practice and legal reality often collide. Cousin marriage in Nepal depends entirely on which side of the family the cousins are related through and how many generations separate them.

First Cousins — Paternal Side

Not permitted. First cousins who share the same paternal grandfather are within 3 generations on the paternal line — well within the 7-generation prohibition. This is the most common type of cousin marriage question, and the answer is clear: it is prohibited.

First Cousins — Maternal Side

Also not permitted. First cousins through the maternal line share a common grandmother within 2 generations — within the 3-generation maternal prohibition. Maternal first-cousin marriage is therefore also prohibited under the Civil Code.

Second Cousins

Second cousins share a common great-grandparent. On the paternal side, this is 4 generations — still within the 7-generation limit and therefore prohibited. On the maternal side, this is 4 generations — beyond the 3-generation limit and therefore permitted.

Third Cousins and Beyond

Third cousins share a common great-great-grandparent (5 generations). On the paternal side, this is still within the 7-generation prohibition. On the maternal side, this is clearly beyond the 3-generation limit. As a practical rule:

In our experience handling marriage registrations, the most frequent issue involves paternal-side second or third cousins. Many couples assume that because the relationship feels distant, it is legally permitted — but the 7-generation paternal restriction is broader than most people expect.

Cross-Cousin vs Parallel Cousin Marriage

In anthropological terms, there are two types of cousin relationships that matter:

• Parallel cousins: Children of two siblings of the same sex (your father's brother's children, or your mother's sister's children)
• Cross-cousins: Children of two siblings of different sex (your father's sister's children, or your mother's brother's children)

Several Nepali ethnic communities — particularly among the Tamang, Gurung, and some Rai groups — have historically practised cross-cousin marriage (known as mama-cheli/fupu-chela marriage). In these traditions, a man marrying his mother's brother's daughter (or father's sister's daughter) was not only accepted but often preferred.

What the Law Says

The Muluki Civil Code 2074 does not distinguish between cross-cousins and parallel cousins. The prohibited degrees are counted purely by generational distance on the paternal and maternal lines. Both types of first cousins share a common grandparent within the prohibited range.

This means that traditional cross-cousin marriages are prohibited under current law, even where community custom has accepted them for centuries. The Civil Code overrides customary practice on this point.

Marriage Between Relatives Who Are Not Blood-Related

Not all relatives are connected by blood. The Civil Code treats these relationships differently:

In-Laws After Spouse's Death or Divorce

Can a widow marry her deceased husband's brother? Can a divorced man marry his former wife's sister? The Civil Code's sapinda prohibition applies specifically to blood relationships. In-law relationships created through marriage are not the same as blood relationships. However:

• Marrying a former spouse's parent or child from a previous relationship may raise legal questions under other provisions
• The social and cultural implications can be significant even where the law technically permits it
• Each case should be evaluated individually with legal advice

Step-Parents and Step-Children

Marriage between a step-parent and step-child is not a blood relationship, but it falls within the prohibited degrees under the Civil Code's broader provisions on family relationships. The law recognises that certain family relationships — even without blood connection — carry a position of trust and authority that makes marriage inappropriate.

Adopted Children

The Civil Code treats adopted children the same as biological children for the purpose of marriage prohibitions. An adopted child cannot marry their adoptive parents, adoptive siblings, or anyone within the prohibited degrees of the adoptive family — the same restrictions that apply to biological children.

Need clarity on whether your relationship is within prohibited degrees? Consult our lawyers →

Cultural Context: Ethnic Communities and Marriage Customs

Nepal is home to over 125 ethnic groups, many with distinct marriage customs that predate the Civil Code by centuries. The tension between customary practice and statutory law is particularly visible in marriage within relatives.

Tamang and Gurung Communities

The Tamang and Gurung communities have a long tradition of cross-cousin marriage. In Tamang culture, marrying a maternal uncle's daughter (mama ko chori) was considered the ideal match. This practice is now prohibited under the Civil Code's sapinda rules, but it continues in some rural areas where customary law carries more practical weight than statutory law.

Rai and Limbu Communities

Among the Rai and Limbu communities of eastern Nepal, clan-based marriage rules traditionally governed who could marry whom. These rules sometimes permitted marriages that the Civil Code now prohibits, and sometimes restricted marriages that the Civil Code would allow. The statutory law takes precedence in legal disputes.

Newar Community

Newar marriage customs are complex and vary significantly between sub-groups. Some Newar communities practise strict clan exogamy (marrying outside the clan), while others permit certain cousin marriages. Under the Civil Code, only the generational distance matters — not the clan.

The Legal Position on Custom vs Statute

The Muluki Civil Code 2074 is clear: statutory law overrides customary practice. A marriage that violates Section 70's prohibited degrees is void regardless of what community custom says. This does not mean that customary marriages performed before the Civil Code are automatically invalidated — but any new marriage registration must comply with current law.

For a comprehensive overview of how Nepal's marriage law interacts with different legal traditions, see our detailed guide.

Consequences of Marrying a Prohibited Relative

If a marriage is registered between persons within the prohibited degrees of kinship, the consequences are serious:

The Marriage Is Void

Under the Civil Code, a marriage that violates the prohibited relationship rules is void — meaning it is treated as if it never legally existed. This is not the same as divorce, which ends a valid marriage. A void marriage was never valid in the first place.

Legal Consequences

• No spousal rights: Neither party can claim spousal inheritance, maintenance, or property rights that arise from marriage
• Property division: Any jointly acquired property is divided based on individual contribution, not matrimonial property rules
• Criminal liability: Under certain circumstances, knowingly marrying within prohibited degrees can attract criminal penalties under the court marriage laws in Nepal
• Children's rights: Children born from a void marriage still have inheritance and legitimacy rights — the void status of the parents' marriage does not affect the children's legal standing

Who Can Challenge the Marriage?

A void marriage can be challenged by:

• Either spouse
• Family members of either spouse
• The Public Prosecutor (government attorney)
• Any person with a legitimate legal interest

There is no time limit for challenging a void marriage — it can be declared void at any time, even decades after registration.

How to Determine If Your Marriage Is Legally Permitted

If you are unsure whether your relationship falls within the prohibited degrees, follow these steps:

Step 1: Identify the Common Ancestor

Trace your family tree and your partner's family tree upward until you find a shared ancestor. This is the person from whom both of you descend.

Step 2: Count the Generations

Count the number of generations from yourself up to the common ancestor. Remember: you are generation 1, your parent is generation 2, your grandparent is generation 3, and so on.

Step 3: Determine the Line

Is the common ancestor on the paternal side (traced through fathers) or the maternal side (traced through mothers)? The answer determines which limit applies — 7 generations for paternal, 3 for maternal.

Step 4: Apply the Rule

• If the common ancestor is within 7 generations on the paternal side → marriage is prohibited
• If the common ancestor is within 3 generations on the maternal side → marriage is prohibited
• If the common ancestor is beyond these limits on both sides → marriage is permitted

When in Doubt — Get Legal Advice

Generational counting can be confusing, especially in complex family structures involving adoption, half-siblings, or blended families. If there is any uncertainty, consult a lawyer before filing for marriage registration. A wrong determination can result in a void marriage — which is a far worse outcome than spending time on verification upfront.

For the complete list of documents you need to register your marriage, visit our guide on the court marriage process in Nepal.

Conclusion

Marriage within relatives in Nepal is governed by clear statutory rules — 7 generations on the paternal side and 3 generations on the maternal side. These rules apply uniformly across all communities, religions, and ethnicities. Cultural practices that permitted cousin marriages in previous generations do not override the Muluki Civil Code 2074. If you are considering marriage with someone who may be a relative, the single most important step you can take is to verify your generational distance before filing for registration.

Our lawyers have handled over 2,000 court marriage cases and can verify whether your marriage is legally permitted under the Civil Code. Do not risk registering a marriage that could later be declared void.

Contact our lawyers for a free consultation on your marriage eligibility →