1. u can file/lodge a police report for threatening. Ur animal brother's gangsters threatened u, and u can file a police report for it. it is safe, plus, in future, if they come at u, the police can react faster, by calling IO directly.

2. challenges/rebutal of the house ownership transfer. u can win this, as long as ur parents agreed to it, and willing to cooperate with you. u can seek any legal consultation, and i am sure, they will advise u the same; your parents need to cooperate with u.