Gerry,
Should your Dad die under the old contract your Mom would get half (50%) minus 5 percent for every year your Dad did not make his 65th year, up to 35%.
My Dad was killed when he was 56 years old. My Mother got 15% of his pension, about 340.00$ a month for my father's 37 years of working on the waterfront.
Eddie Mondor 34835