I am astonished that people allow eldughs into the most private and intimate places in their lives... Your mother dubbing him in was mean and disloyal - though I can understand her bing hurt that your Dad likes looking at other lovely looking women.
Of course if he had been molesting little boys, it would all be hushed up.
I hope the treatment gives him some help, and more time to spend with you. he should cut all the spiteful JWs shunning him out of his will.