One of the problem triggers in a marriage is when a mother or even a father in-law takes it upon themselves to continually reassess their daughter or son in-law .This unfortunately does not help anyone including you.
In the interests of your son or daughter, stop bringing the fault of their spouse to them or to anyone at all. If you look out for mistakes in your daughter in-law you will find many, all because you will fail to see the good and lovely side of her. If you are on your son in-laws case and determined to prove that your daughter married the wrong man that is what you will achieve.
For a couple to enjoy the best of each other and function as a family they need inspiring words especially from their parents. Remember a husband’s happiness is tied to his wife and the wife’s tied to her husband.
You cannot be against one and expect the other to function at his/her best.
Even if you notice any shortcoming correct and help them in love.
A word fitly spoken is like apples of gold in settings of silver (Prov.25:11).
Try not to be harsh on them. You can never go wrong being gentle and having an understanding of their feelings.
Also realise that some things cannot be changed especially any unpleasant happening from the past in their life. Never bring what went before in the negative up with them-please, IT HURTS!
Pray for wisdom to be able to reach to your daughter or son in-law always. Be ready to accept them as your children together rather than accepting one and resenting the other.
Remember they are now one and if your son/daughter is happy with their wife/husband the way they are,-support them.
God bless you.