As You Are (2016)

Jack's mom starts dating a bouncer in 1993-4, who later moves in. He has a son, Mark, who's same age as Jack and they become close friends. Jack and Mark get beaten up outside a diner by 3 guys and they meet and befriend Sarah. The three all attend the same high school. The dad teaches them to use pistols. The parents and the trio are later questioned separately by the police about their relationship to each other.