HD,
To answer your question, the question was, "What did your father and/or grandfather actually shoot? Model, bbl, length, &c."

Some answers have wandered from that original question, probably causing you some further confusion.

My answer(s) to the question:

My father shot a 12ga. field grade Winchester model 97 w/28" bbl.

My paternal grandfather shot a 12ga. Parker, but I cannot tell you which model as it was lost to posterity before I arrived.

My maternal grandfather shot a 12ga. Belgian SxS guild gun w/30" Damascus bbls. & Jones under lever.