According to the provisions of Article 10 of the Marriage Law, bigamy, there is a family relationship that prohibits marriage, before marriage suffering from a medical disease that should not be married, marriage has not been cured, not to the legal age of marriage, these four circumstances are invalid marriage, the parties can go to the people's court to Sue for invalid marriage, and provide relevant materials, the situation is true, the court will determine that the marriage is invalid.
1. The marriage certificate is invalid
(1) The parties are bigamous.
(2) The parties are in a kinship relationship where marriage is prohibited.
(3) The party suffers from a medical disease that should not be married before marriage, and has not been cured after marriage.
(4) The parties have not reached the legal age for marriage.
Second, the method of applying for marriage certificate is invalid
The parties bring relevant documents to the people's court to Sue for annulment of marriage. The reasons for the prosecution are different, and the materials brought are different.
For example, to apply for an annulment of marriage on the grounds of bigamy, you need to provide the identity cards of both parties, marriage certificates, and evidence that can prove that the marriage is bigamy.