hes your brother, he likes to spend time with you, let him
A family meeting to discuss the situation..
You should talk to your dad individually and ask for a lock.
Of, I'd spend more time in the family room or another room where your brother can't harass you.
duct tape. then throw him in a closet and shut the door.
put a lock on your door and talk to your dad when bro isnt around and be honest with your dad, Im sure he will listen and understand, good luck
Stop talking to him, ignore his existence. I did that to my little brother once and he came crying to me and said he was sorry.