. >>> next, another american history tv interview, this one with massey mckinley, great great grandson of glover cleveland and great-nephew of william mckinley. >> we are talking to you at the presidential site summit in washington d.c., you are here because you work with the organization and also because you are the descendent of two presidents, tell me your family story . >> i'm related on my maternal side to grover cleveland was the 22nd and 24th of the united states president and on my father's side on the fraternal tied to william mckinley, i'm the great great-nephew of william mckinley in the great great grandson of grover cleveland . >> how did the two families get together? is back it's happened chance because my parents married in the two became one . >> were your parents aware of the lineage when they married? >> they had no clue. my father was a longtime history professor at u ga, during the course of time, at the breakfast table we talked about presidential politics and presidential descendents and i learned so many stories from both families from the conversations i had wi