Yes he/she is now an adult.
Potentially. If the proper authorities find reason to believe that the child is at risk of obtaining drugs illegally, or that the child is also at risk of an overdose, the authorities can remove the child from the home for "Child Neglect".
Interpretive as any obligation to support runs until age 21
You don't. Once the child is an adult, child support is moot and the ex is home free.
yes you could
Julia Child's hometown is Pasadena, California.
If the parents own the car then yes. If the adult child owns the car then no.
Your child should be over 20 years to remove the child from home in Virgina. ADDED: The legal age of emancipation is Virginia is 18 years.
No
18
Pasadena, California.
No that person is an adult and child support stops at 18.
Since this is an adult child still living in the family home all you have to do is ask them to leave. If they refuse change the locks on the door. You no longer have responsibility for this person unless you want it and parents do not rent to their children so the "rental agreement" is not needed. You can also call the police if they refuse to do as you ask.