The main character assaults his sister's boyfriend with a sledgehammer and a beating (to stop them from the crime of having sex). We learn soon after that he apparently also hit her as well (but for her own good because he cares).
The angry man-child son attempts to beat up his too old for high school teen sister, but their father intervenes.
Father and son engage in a scheduled one-on-one backyard brawl to determine who gets to be the man of the house. The son ends up getting TKO'd about 10 seconds after he starts the fight.
The main character of this movie spots his sister in a club with her boyfriend, so he attempts to choke her at the bar before throwing a punch at her BF and threaten to kill them.
Adult teenage son watches with a sinister smile as two of his friends r@pe and beat his mother.