Legal Question in Family Law in Pennsylvania

Where did your grandmother live at the time of her death? Most states have anti-lapse statutes if there is no provision in the will.

If I get what you are saying, your uncle and father died prior to your grandmother. Does the will say anything about what happens if a child predeceases here? If so, then that is who gets the property. If the will is silent and a child died before your grandmother, then the grandchildren would inherit the share of the deceased parent under the anti-lapse statute.

So if grandmother had a will which left her home to her 4 children, and 2 of them died before her and the will is silent as to what happens, then the 2 living children of your grandmother (your aunt/uncle), the children of your dead uncle (if any) and you and your siblings would all inherit. The uncle's children get 1/4 and you and your siblings would split 1/4 (unless the will specifies a per capital distribution rather than per stirpes).

Regarding sale of the property, I don't see how your grandmother's wishes would be enforceable. If 3 of the kids wanted to sell and 1 did not, then the 3 could seek partition and force a sale. But getting back to your issue - you, your siblings and your cousins would have to agree to the sale of the property. If the property is sold you and your siblings get 1/4 and your cousins (children of the dead uncle) get 1/4 and each of the living aunts/uncles get 1/4.