A single parent family is a type of family with only one parent present with either a blood related child/children or an adopted one.
Adoptive or adopted. A child is adopted, a parent is adoptive.
you need to ask your parent or adopted parent
Yes, as long as they are no longer minors.
no
No but he was adopted!
When adopted you have the same rights as the biological children to inherit your parents.
No but unethical.
Yes. The next of kin has adopted many children.
In most countries, only if he officially adopted them.
I don't see why not
Not until the child has reached adult age. In order for the child to be adopted the parent had to give up parental rights so they no longer have rights to the child.