Sapinda relationships are prohibited under Hindu marriage law. A sapinda is someone who is:
- within or has a common ancestor relative within three generations above you on your mother’s side of the family
- within or has a common ancestor relative within five generations above you on your father’s side of the family.
A sapinda can be someone from your father’s side or mother’s side hence, you are not eligible for a hindu marriage if you marry someone who is a Sapinda.
However, in some cases, despite a sapinda relationship being prohibited by law, a person’s custom might still permit a marriage with another person. In this case, they can get married because their custom allows them to do so.
Jail time up to one month or a fine up to Rs. 1000 or both is the punishment but there are exceptions.