How to prove malicious intent (money) in reporting ill treatment for parent against wife?

mildgiant, I thought for a moment you were the OP in this message, but see you're not and that your story is different. You will probably get better responses if you start a new thread of your own.

they(stepson )will not allow him to talk on phone--he has control of his fathers money but acts like it is his --

he is not allowed to talk on the phone --

I would stay out of a Daddy-Daughter thing. It is between him and her. If you are the second wife, you belong in the Second Wives Club. Often the adult children do not like the second wife, perhaps because she is not their mother. The second wife, however, cannot speak poorly of the children, because they are the man's children. I would chill and leave it alone except to defend yourself against any unfair accusations. If the second wife gets the mortgaged house in the will, then it will stand. The house does not belong to the children.

Is it the house the children grew up in? That might be a big sticking point for the daughter if it is. She will be territorial. If it isn't, she has no dog in the race.

What makes her think this will happen? Is there a Will stating wife gets the house? Here in NY, if there is no Will, the wife gets 2/3 and the children get 1/3. Check the probate laws for his state, don't just assume.