The cousins of your in-laws are not related to you and neither are their parents. However, the parents of your spouse's first cousins are your spouse's aunts and uncles, and thus your children's great aunts and great uncles.
If you have no parents, you are considered an orphan.
No. She would be considered a run away.
No as that would be considered child abandonment.
not legally i guess because it would be considered running away if your parents did not give you consent and your parents can have you escorted back to your parents house by police
Once you're married, you're legally considered an emancipated adult and would not be covered by your parents' insurance. You would be covered by your spouse's insurance.
if you don't have their permission, yes.
Voldemort killed his parents.
It would be presumed that you have your parents' permission to attend college, which would be considered acceptable.
If you are a white woman and your baby's father is Turkish your baby would be half white half Turkish (mixed). Native Turks are not considered Caucasian.
Yes, taking your parent's car without permission and running away with it would be considered theft. It is illegal to take someone else's property without their consent, even if they are your parents.
If he wanted to be considered British then YES.
18 is the the age where you are no longer considered a minor in the USA. Any state would allow you to be married at 18, and since you are legally considered an adult your parents cannot stop you.