My grandpa hit my grandma a few times. She's an evangelist so she was trying to save his soul.
He was legit crazy. He had SEVERE PTSD from being in Vietnam.
He called all Asian people Charlie, every time gun-like noises would go off he would flinch, and he was also addicted to heroin. He's not my blood, he's a step grandpa (WTF is that...).
Honestly, I could see through all of the craziness he was a good person, just with a lot of issues, but IMO he was to far gone to salvage. He hit my grandma so he gets no love
He's dead though now. I guess it wasn't a common thing, but she stayed with him trying to send his soul to be with the LAWD

.