2. Treat your son's wife as his wife, not as your own daughter, maybe just treat her as a friend. Your son would always be your Junior but, if you think that his wife is of the same rank and if you ever scolded her, she would remember it for life.
In real life, only her own mother and not you will be viewed as a person qualified to scold or correct her.
It is your own interest that you enjoy your retirement years. Better if you could utilise enjoy everything that you had saved before you die. Don't let your wealth become worthless to you.