I always err on the side of letting the parents get away with abuse. I take very seriously the motto, “not my kids”.
It has to be quite blatant before I’ll get involved. And I don’t mean seeing parents beating their kid in public. I mean seeing them SEVERELY beating their kid in public while smelling of Jack Daniels.
Not my kids. God gave them to someone else. I’ll intervene only when asked, unless the situation is unquestionably grievous.
I’ve seen several cases where I thought the child was abusing the parent.