I couldn't root for any of the characters
The mother was a harried mess and whiny (what Teri Garr always plays), the boyfriend was a bum and an abusive SOB, and the boys were typical preteens/teens. None of the characters were that likable. Of course this was also set in New Jersey, not exactly the friendliest state.
Also, I think in the "real world" (as what was pointed out in this movie), Sam would retaliate sooner or later.