Daughter05/2/1975, son in law 07/16/1976 having marital and money problems. Will they divorce?

My son in law handles all the money. They are beyond broke all the time. I am tired of helping. He makes good money and has hidde money from her before. The have two kids at home yet. They both are making the girls miserable. Im all prayed out! Hate to feel this way. If he is hiding money again I need to find it. Doesn't pay the bills, begrudges what he does do for girls. Blames my daughter for money issues. She has to ask for any money she needs. Also doesn't like her getting help for emotional and physical health issues. Help!