The only option you have now is to ask the lawyer who filed the original paperwork why he thought you may qualify for adjustment inside the US.It is rather peculiar that your father was able to get a "petition" granted in front of an Immigration judge & without knowing what the benefit was,there doesn't look to be much that can be done but to abandon the petition imo.

Your options now are to find out for sure :

1.What was the adjustment of status application for your father based on & WHEN it was filed ?

2.Were you & your brother placed on the petition as derivatives ?