Where to start with the problems? haha
He probably has some kind of enheritence the uncle wants, but the story hasn’t even mentioned anything like that yet, even if that next chapter explains it it will still feel clumsy.
If the uncle wanted him dead he would have had mc killed while the uncle had an alibi not personally kill him, opening up the possibility the other siblings can blame it on him and cut him out of the inheritance.
Also at most mc was on the third floor, a fall from that height would fuck you up but it sure as hell wouldn’t kill you.