an adoptee, or adopted child
Someone who assaults someone is called an assaulter.
You can adopt someone to be your child but to be your nephew he had to be adopted by your siblings. Then he will be your nephew. There is no nephew-adoption.
imposter
The law states that the person being adopted must be a child. Therefore, no.
A "Turkish" person
if you mean if someone does not believe in God, this person is called an atheist
It is called suing. You sue someone.
It is called suing. You sue someone.
this person is called a contortionist.
When someone else writes about someone who is deceased, it is called a biography.
maybe someone who attract you
Such a person is called a "mercenary" or it may be said the person is "materialistic."