What if my son-in law concealed being a divorcee at time of marriage?

A man married a woman by suppressing the fact that he was married and divorced earlier. Before marriage, the woman's family had this suspicion but the man himself, the man's family and relatives, even though they know about his earlier marriage and divorce, lied to the woman and woman's family that he was not married / divorced earlier. Now the woman's father could procure the man's earlier marriage certificate, divorce order and divorce decree from a family court. He did not tell his daughter yet about this as his daughter is believing her husband blindly like a sheep and she may argue that these documents are fabricated by her father. This happened before his daughter married that man. So what are the legal options before this father?