Not normaly.
NO it isn't. he has parental consent
No! how is it wrong to like a eighteen year-old??
Criminally, no. An adult, whether they're living with their parents or not, is fully responsible for them self. The eighteen-year-old, and he alone, can and will be held responsible for their own actions. In civil matters, it may depend on the circumstance. If the parent co-signed on any kind of loan or payment for the eighteen-year-old, and the eighteen-year-old does not keep up with the payments, the cosigner can be held responsible for those payments.
no.
1990
Up to parents
Yes
Yes, both are adults.
with your parents consent yes
No
Parents don't emancipate their children. A court can emancipate them. Parents just kick them out when they turn 18. There isn't a process or form that has to be signed. So, what is the process to have the courts emancipate the eighteen year old, assuming the parents will (a) allow the eighteen year old to live at home, under rules of the home (b) the needs for the eighteen year old will be met and (c) the parents are seeking some legal protection from any acts of the eighteen year old.