In Jain dharma and in Indian law, this kind of marriage is generally not allowed.

1. Jain viewpoint (religious/custom side)

• Jain scriptures mainly stress: ahiṁsā, purity, good conduct.
• For marriage rules (kinship, gotra, generations), Jains mostly follow traditional community maryādā (customs).
• These customs are very strict about not marrying close blood relations, especially on the father’s side (same vansh / close generations).
• In most Jain communities, a match within a few generations on the father’s side is treated like a close family relation and avoided.

2. Legal viewpoint (India – Hindu Marriage Act, which also applies to most Jains in practice)

• Law says you cannot marry if you are “sapinda” to each other.
• Sapinda = up to 5 generations from the father’s side (counting you as the first generation).
• So anyone within 4 generations on the father’s side is still inside this prohibited range.
• That means: marriage to a 4th‑generation relation on the father’s side is normally legally prohibited, unless there is some very specific, recognized custom to allow it (rare, and you would need proper legal/community guidance).

3. What you should do in practice

• From a Jain dharma + Indian law perspective, such a marriage should be treated as not permissible.
• You should verify the exact relationship with:

- your parents/elders, - your local Jain saṅgh leader / pandit, and - a local lawyer (to be 100% sure about the legal side before taking any step).

For more Jain-focused guidance on marriage and customs, you can read here