We have a person in our family who we would never leave our kids alone with. Our kids are grown adults now but back in the day, yeah, they never left our sight. Not because this person was a sexual predator, more because she is nuts, certifiable, and would go off her meds and be subject to delusions and wild fantasies.
Watching and listening to Joe Biden gives me the same feeling. No-way I would let a female family member (of any age) near that creep. He's losing his grip on reality and he obviously has a problem keeping his hands to himself.