This could have been written by my siblings or I. I controlled my father's access to my children and never ever left him alone with them. I listened to that inner voice, gut feeling. It made it easier that we lived in another city and that my mom had passed before my kids were born. She had enabled my dad and covered up for him when he abused my siblings and I, but it would no doubt have been more difficult to deal with. My only regret is that keeping my dad at arm's length was by passive manoeuvres all those years and that it took me until recent years to take back my power, confront him and say farewell for good. 

Listen to your gut and don't question your maternal instinct to protect your kids and raise them in a healthier family dynamic than you had,