The question was"How do you know he won't talk to her."
I posted some indirect evidence, since I don't live with them, nor am I privy to their private conversations.
My statements "wash" because they are statements of fact.
You may certainly consider them insufficient, but you have also not posted any contrary evidence.
I might also add that Keyes has _de facto_ taken the private family matter public by cutting off his daughter's college funds. When she sought alternative sources the information was bound to come out.
An interesting admission. It certainly doesn't stop you from rendering a judgment that the adult daughter is telling the truth.