Don't try to confront him when he's drunk. Talk to him calmly and assertively when he is hung over and at his most vunerable, and explain to him that his behaviour is hurting your mother and yourself and that he must get help.Never enable him, by fixing problems caused by his drinking or giving him money.
Only if he is divorced or his wife is dead. Some states such as Maryland forbid marrying of a stepdaughter, stepson, stepfather or stepmother. See related link, section 2-202 of Maryland Family law.
possibly but it depends on the alcoholic's behavior
"Allow?" It isn't the children's responsibility to control their stepfather. Afterall, the stepfather is controlling them. They probably don't know what to do and are trying to understand what is going on.
You have to sit down with your stepson make him understand that you can no longer support him as he is an adult.
An adult beverage is a euphemism for an alcoholic beverage - intended for consumption by adults.
If he serves the role as your father, why not make it official?
An alcoholic should have the same blood pressure as anyone else, less than 120/80, if they are an adult.
Are you a judge? If you answer "no", then you have no authority to compel an adult into rehab.
If he is not a formal tenant, then tell him to leave; when he doe snot do so, call the police and inform them that an intruder is in the house.
No. The others do.
buy her her own house
He is no longer a minor at 18, he is an adult. He is all ready emancipated.