In Jain Dharma, marriage is mainly a social institution for grihasth (householders). Scriptures focus more on character and conduct than on detailed “marriage law”. For relationships within an extended family, Jains mostly follow traditional community rules (gotra / blood‑relation limits) for health, lineage, and social order.

Below is the simple Jain-oriented view:

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1. Close blood relations – clearly not acceptable

As a general Jain and Indian dharmic norm, marriage is not allowed where there is close blood relation, for example:

• Own brother–sister
• First line relations: chacha’s daughter/son, mama’s daughter/son, own bua/maasi’s children (depending on community, these are treated as too close)
• Any relation considered “like brother–sister” by family tradition

Reason:

• Protects health of future children (genetic issues).
• Maintains maryada (respect boundaries) between near relations.
• Prevents strong attachment and passions (kashāy) in tight blood circles.

This is accepted by both Digambar and Shvetambar families as basic dharmic/common‑sense restraint.

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2. Gotra / kul and “sagotra” marriages

Many Jain communities (especially Śvetāmbara groups like Oswal, Porwal, etc.) follow:

• Do not marry in the same gotra / kul (sagotra marriage generally avoided).
• Try to keep some distance in the family tree (often 5–7 generations on father’s side, sometimes on both sides).

Note:

• This is more of a community‑social rule than a direct scriptural command.
• Some Digambar families do not emphasize gotra much, they look more at:

- Not being close blood relatives - Different family line / village / surname

If your family or community has a rule like “same gotra = no marriage”, that is normally followed seriously.

You can read a simple explanation about Jain marriage & gotra customs here

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3. Cousin marriage (extended family)

This is where practice varies by region and samaj, not by core Jain philosophy:

• Many Jain communities (especially in North/West India):

- Treat most cousins (father’s side or mother’s side) as too close. - Strongly discourage or simply do not allow cousin marriages.

• Some communities influenced by local customs may allow certain cross‑cousin marriages, but this is regional social custom, not a Jain religious rule.

From a Jain standpoint:

• Dharma view: avoid situations that can lead to family conflict, attachment, jealousy, or genetic risk.
• So if a match is within the extended family, elders generally check:

- Blood relation distance - Gotra / kul - Community rules

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4. What Jain Dharma itself emphasizes in marriage

Regardless of relation:

1. Ahimsa – No harm to body or mind of partner; non‑violent lifestyle (pure vegetarian, no addictions, etc.).
2. Brahmacharya for grihasth – Sexual conduct only within marriage, with restraint and fidelity.
3. Aparigraha – Simple, low‑show wedding; no dowry pressure, no waste.
4. Good character – Truthfulness, good habits, care for both families.

So, from pure Jain dharma, the key question is: Is the relation dharmic, healthy, and free from undue attachment and harm?

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5. Practical guidance if you’re considering such a match

1. Check exact relationship

- Draw a simple family tree and see how close the blood connection is. - If it’s clearly close (like first cousins or closer in many Jain samajs), usually it is not approved.

1. Follow your community’s maryada

- Ask respected elders (dada‑dadi, nana‑nani) and your local Jain sangh. - They know your community’s rules about: - Gotra - Minimum generational distance - Accepted/forbidden relations

1. Think of future children and family harmony

- Where medical risk or strong family objections exist, Jain viewpoint favors avoiding such a marriage to prevent long‑term dukh (suffering).

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Essence

• Jain scriptures do not give a big list of “allowed/forbidden relatives”, but:

- Close blood relations → marriage should be avoided / treated as wrong. - Same gotra / very near family line → generally avoided as per Jain community practice.

• Digambar and Śvetāmbara both support healthy distance in family lineage, with detail varying by local custom.
• Always keep ahimsa, health, and family peace above personal attachment when deciding.

If you tell me exactly what kind of relation (e.g., “mother’s brother’s son”, “father’s cousin’s daughter”), the general Jain‑community view for that type can be explained in more detail.