some families have a disfunctional attitude about the "pink elephant" in the room. they think it reflects badly on them so they choose to ignore the truth. it makes them upset so they deny it's happening. i'm not defending them-my family is the same way. but once i learned what it was that made them ignore my situation it helped me to understand. they are not capable of wanting to help.
if your cousin approaches you again verbally tell him to leave you alone!!! it's called ABUSIVE behavior. not acceptable!
i'm so sorry you have the same type of situation. you are worthy of being treated better but know that a healthy response may not come from your family.
hope you will speak of this to your T.