Back in the '30s my husband's grandma used to feed the hobos at the local tracks. They were allowed in the house, fed, and sent on their way. One day one of them was being a Peeping Tom. When the police showed up my husband's grandpa was outside beating the hobo. Not something you could get away with these days.
Back about the same time period, my wife’s grandfather caught a peeping pervert peering through his daughter’s (my wife’s aunt’s) bedroom window. Two rounds from a shotgun put a (permanent) end to that nonsense ...
I hope your husband’s grandpa beat him up really good.