Only if it is in the parents' home and they don't want it there. They should return it if the child wants to keep it somewhere else, however.
It depends. What things are you referring to? Drugs? Cigarettes? P0rn? Explicit music? Or are you asking if parents have the right to take away certain things like a phone or electronics, due to the child's behavior? What behavior of the child caused the parent to threaten to do so? Does the child pay rent and other bills? How old is the child?
Certainly, loving parents have the right to set boundaries and control a child's behavior by limiting privileges - even if that means taking items the child bought themselves.
18+ I think no.
Are you really 31 to 35 years old?
...cuz your question makes you sound like a spoiled 14 y/o...
I never found it necessary to do with with my 2 kids. They are both over 25 now.
This issue arises, especially, in instances of child celebrities. One obvious example is children who starred in movies like Harry Potter.
I don't think so
If you live in the parents home, YES! My house, my rules. You don't like it.....move out. Then you can do whatever you want.