According to Section 11 of the Hindu Marriage Act, 1955 any marriage solemnized after the commencement of the Act shall be null and void and may, on a petition presented by either party thereto, against the other party be so declared by a decree of nullity if :

1. either party has a spouse living at the time of the marriage

2. the parties are within the degrees of prohibited relationship unless the custom or usage governing each of them permits of a marriage between the two

3. the parties are sapindas of each other, unless the custom or usage governing each of them permits of a marriage between the two