While this is not anyone in my family, I witnessed a father at a party treating his adolescent daughter like crap. The daughter's kind of introverted and didn't socialize too much, but the father would frequently approach her, say something offensive, and when she would retaliate, he'd punch her in her arm and sort of wrestle with her, but she didn't enjoy it and wasn't having fun, often screaming for her mother to get him to stop, but the mother wouldn't do anything either. He would stop after she screamed for her mother though, but the fact of the matter is that if he's annoying and agonizing her this much in PUBLIC, he could be treating her even worse in private.
He seems to see her as a "teenage punk" and treats her rough because I guess he is either a jerk or also doesn't like the way that she treats him, but maybe she treats him distantly because he is treating her like crap? I don't know, but one time she stayed sleeping longer than usual, and she was in a bad/annoyed mood, and I saw him grab her and start clapping really loudly in her face, and when she throw an arm in his direction, he twisted her arm behind her back and put her in a headlock and everyone was laughing but her face suggested that she didn't find it funny at all.
Basically, he yanks her by her arm, punches her (not as hard as he can, but still does it with some force to anger her), and is always roughhousing her, even though she doesn't like any of it and resents it/him despite lots of people laughing like it's "father-daughter-time" or such, but I feel that she's being negatively impacted by this by being the target of his behavior towards her.
He often doesn't do it out of visible anger like one would think, but laughs/finds it amusing to do. I do not tell anyone because he's my relative's boyfriend's sister's husband, and I don't want to start my trouble with everyone, including family members of my own by saying anything negative.
Any input? I'm asking if anyone considers this as abusive or not.