You might want to write down what your D told you, if he gets more into his "love" life it may be protecting her to have the visits in a more controlled environment.
He has inappropriate boundaries with his D.
Would he do family counseling with her?
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss