How do you think of your brother/sister (if any)? What do you hate and love about them? How do you treat them?
I love my brother, but our relation switched at some point. He's 12 years older than me and for a long time he was a sort of a parent to me. He annoyed me in the ways parents do - telling me off, making me do household stuff. Then I entered my late teen years and we started hanging together with his friends at bars and house parties.
Now though he's in a divorce and the roles are reversed - I am the one trying to help him, as he remained an even bigger child at heart.
He's been a great influence, tho.