They can be picked up and returned home, or perhaps placed in the foster care system.
They can return them to their home. Or they can take them to foster care.
Run
No he is not. He is too old to be in foster care because he is 21 years old.
Without knowing any details...the state will not remove custodial rights from a parent/place a child in foster care just because the child is 'unhappy'. Discuss the situation in detail with your school counselor for advice.
Depends on the state laws and if you are in foster care it's not up to your parents to decide but the judge.
how can you work in a foster home
She can apply at the local courthouse and see what happens. It is up to the judge.
No.
A minor is placed with foster parents by means of a court order. That being the case the minor would need permission of the court to legally change residences or he or she would likely encounter problems with the state agency that oversees the foster care and welfare of said minor.
no, your on your own. It depends upon the individual's circumstances, the minimum legal age is 18, so a 17-year old could be placed in a group home if they do not have a acceptable place to live.
TO be emancipated you need to be able to act and function as an adult. You need income, insurance, housing, etc. and it is most unlikely that any 13 year old could. It is much more likely that a 13 year old wishing to leave home would be made a ward of the court and placed in foster care.