I think this is an issue that many parents deal with when their children get older and have vehicles. The thing is that you both have to have respect for one another and the "child" has to observe the niceties as they share your home. Otherwise, they are just using you. I suggest you have a talk with the child, mutually setting expectations and then follow through if he doesn't. Things are bad, not horrible, if they are maintaining school attendance and grades--don't believe the child. Obtain copies of progress reports and report cards from school. If the child is not producing, show them the way to a GED and to a job. Then, if you own the car, retrieve the keys and stop paying the insurance. Change the locks on the doors and windows so they have to knock to get back in. If you are providing for expenses, and/or a cell phone, cut them off. These are all privileges that are earned by contributing to the household. You can also redecorate the room, and pack up their belongings.
This all sounds tough, but believe me, it only gets worse the longer you put up with it. You can be firm and still tell the child you love them, and ask them to dinner. Delayed maturity and growth just costs you worry and money as the child gets older and brings higher expenses with them. Credit cards, children they can't or won't care for, sponging of you because they can't afford a home, and drug problems are possible future issues.
Report them as a runaway to the authorities. They will attempt to find them and return them home.
In Connecticut, a 17 year old runaway could be brought back home by law enforcement if a court order or a report of suspected abuse or neglect is involved. Otherwise, there are typically no specific laws requiring a runaway teen to be brought back home.
If you leave home without your parents' permission you can be declared a runaway.
If the 17yo is a runaway, yes. It's illegal to help a runaway from home.
The parents can request the police to return the runaway to their home.
Assuming they're absent from home without their parents' permission, absolutely they're considered a runaway.
Report them as a runaway and ask the police to return him home.
Since the 18 year old is an adult he or she will be arrested. The 16 year old is a minor and will be sent home to parents.
Yes.
No, unless they don't talk to their parents. If they talk to their parents then they are not a runaway.
Yes. This can be considered kidnapping or custody interference. If a runaway child knocks on your door allow him to come in and feed him/her, but call the police immediately. Do not take the child back home-- it may be abusive.
No, if the 17 year old isn't where their parents expect them to be, they are a runaway.
A 17-year-old is a minor and therefore does not get to choose where they live. Ever heard of the Becca Law? It was passed in WA after a teenage runaway was murdered. It basically gave parents more 'power' in dealing with runaway/disobedient/truant children. You would be considered a runaway and you would be returned home.