no one care about your family affair.

unless your uncle and aunt sign over the house, there is nothing you can do actually.

don't bother with the my mother has been paying story, no judge care about who has been paying.
Bank only know that the house is under your aunt and uncle name. legally its theirs.

ohhh you better hope they don't die too soon or the ownership transfer to their children automatically, which means even more people need to sign ...

bottom line, get their signature.