1. If a serious illness is not truthfully told before marriage, the marriage may be revoked.
Article 1053 of the Civil Code: If one party suffers from serious illness, it shall truthfully inform the other party before marriage registration; If it fails to tell the truth, the other party may request the people's court to cancel the marriage. A request for the annulment of a marriage shall be made within one year from the date when he knows or should know the reasons for the annulment.
2. It is clear that if one of the husband and wife fails to sign or ratify, it does not belong to the same debt of husband and wife.
Article 1064 of the Civil Code: The debts incurred by both husband and wife with the same signature or with the same meaning after ratification by one party, and the debts incurred by one party in his own name for the daily needs of the family during the marriage relationship, belong to the same debt of husband and wife. Debts incurred by one spouse in his own name during the marriage relationship that exceed the needs of family daily life are not joint debts of husband and wife; However, the creditor can prove that the debt is used for the husband and wife's life, production and operation, or based on the same meaning of both husband and wife.
If one spouse thinks that the child is not his own, he can bring a lawsuit to the court.
Article 1073 of the Civil Code: If there is any objection to the parent-child relationship and there are justified reasons, the father or mother may bring a lawsuit to the people's court to request confirmation or denial of the parent-child relationship. If there are objections to the parent-child relationship and there are justified reasons, adult children may bring a lawsuit to the people's court to request confirmation of the parent-child relationship.