There's probably only one scene that implies sex when the mother brings a guy home one night but the scene ends when she and the guy go into the bedroom.

Some domestic violence (yelling and arguing)

A guy talks about putting a lady through the wall

A mother slaps her son

A kid breaks a couple of dishes

A few yelling and arguments.

There's some biker violence as well (grabbing, chasing, scaring off, punching, attacking, throwing people off)

A kid slams another kid against the locker.

A kid burns his hand a bit on a tiny pebble he was boiling in water for an experiment.

A lady breaks a kitchen lamp and then smashes a whole shelf of glass cups.

The F-word is used twice. There's a bunch of other language which include several shits, and bunch other lighter swear words like ass, damn, bastard, hell, and occasional name calling stupid, retard, freak.

The mother in the film is addicted to drugs. At least three or four times we see her or its implied she takes drugs. We even see the drug dealer too!

Towards the end of the grandparents visit scene she really gets stoned.

In addition a lot of other characters drink and smoke (the mom does this a good bit too).

The drug use, arguing, domestic problems, biker rituals and violence is pretty disturbing.