Which words are being defined?

1. Your current boyfriend is the one that you have now.
2. means get married again.
3. are all the members of your family.
4. Your friend is the one you like more than any other.
5. An friend is someone you have known for a long time.
6. are two children born to one mother at the same time.
7. is an informal word for a friend.
8. is the noun when two people are friends.
9. Your is the man who is married to your mother but is not your father.