yes you could
The parent. In most states, the parent is responsible for the child until the child officialy becomes an adult.
That parent would be in violation of a court order, so yes, they would be in trouble. The adult makes the decisions, not the child. The child should be put into a car and driven home.
I don't know about 'perceived' but they do have an objective role. To morally guide the child and prepare him for independence as an adult.
They can tell them to leave. Once a child is an adult, usually age 18 depending on the state, the parents are no longer legally responsible for them. They can even charge them with trespassing if they don't leave.
Not on taxes no. The parent the child lives with has the main right to claim the child. But if that parent can't or doesn't want to then the other parent can
The right to tell them to move out. They are no longer responsible for the adult and can have them forcibly removed.
Receiving mail as a guest in your parents' home does not give you any legal rights in their property. You may be entitled to notice under state laws if they want to evict you but you have no other rights in the property.
It depends on who the home is willed to.
no is not you dumboos
Unless there are unusually circumstances, once a minor becomes an adult under the laws of the state in which he or she lives (or as stated in the support order) child support ends. If he or she has established residence outside the custodial parent's home with the approval of the custodial parent, the obligated parent should petition the court to have the support order amended or rescinded. Child support money is for the support of minor children and not "owed" to the custodial parent. The custodial parent does have the legal right to sue the obligated parent for any arrearages or "extra" expenses incurred while the minor child was in his or her care.
At 18 years old, you are considered an adult and your parents are no longer responsible for your support unless there is a child support order saying otherwise.
If a Parent so chooses to home-school their child, there is no law against it so long as there is a basic curriculum the child can follow, and the the parent registers their home-schooled child with their respective state. It is ultimately the Parent's decision whether or not to place their child in public, private or home school. It merely depends on what the parent feels would be a more productive learning environment for their child.