how do I see a will that an executor wants to deny exists and I don't know who the attorney was that drafted the paperwork?

The executor of my late father's will is his wife, I am estranged from her and she is denying his daughters information about his wishes/will. I do not know who my dad's attorney was, how do I push for this information to be given? My father had several duplex properties before he married this woman and he expressed that each of his daughters (there are three of us) would inherit one apiece and a split of the odd number would also happen. I believe she is taking funds out of the estate, namely rent coming from these duplexes. How can we push to see the contents of the will?