this isnt your worst nightmare, you should start considering what will happen when he no longer own "your parent's house", ppl like this only know how to spend money, those assets wont last very long.

draw the line now, ask your parent to pick a side, if not after a while u might need to help your "bro" outta something or he go take loan and your parent still be guarantor or something.

What is lost is lost, u cant do much, but the future, u can predict and prepare.

just forget about the house, it never been yours, it belongs to your parent and he cheated your parent's house, its your parent's problem, even you fight it back to your parents, what others will think, now he is the bad guy, and when u win, u are the bad guy, if u are capable, why want to fight for something that never yours ?

i already said that at my 1st post, better draw the line now and predict the future, your parents might still side with him, and you want to help your parent, its a never ending story.