New stepmom to a 17-year old boy! HELP!!?

I am a new stepmother to a 17-year old boy that is an only child. I have no children of my own, and I must say that I would have raised this child differently. Nevertheless, now I am stuck between how I would instinctively punish him for a snotty mouth, and how he has gotten away with so much (not from his Dad,... show more I am a new stepmother to a 17-year old boy that is an only child. I have no children of my own, and I must say that I would have raised this child differently. Nevertheless, now I am stuck between how I would instinctively punish him for a snotty mouth, and how he has gotten away with so much (not from his Dad, but from other family members).

Anyone have any advice???? It's getting pretty bad around the household.
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