
A political family (also referred to as political dynasty) is a family in which multiple members have or are involved in American politics — particularly electoral politics. Members may be related by blood or marriage; often several generations or multiple siblings may be involved.
In the United States, many political families (having at least two generations serving in political office) have arisen since the country's founding. Such as the Adams, Bushes, Clintons, Dupont, Harrisons, Hoars, Keans, Kennedys, Lincolns, Livingstons, Madisons, Randolphs, Rockefellers, Roosevelts, Shermans, Tafts and Uphams families.
The largest know U.S. political family is currently believed to be the Kellogg-Adams-Seymour-Chapin family with 1,733 family members spanning from 1588-Present
Political Graveyard Reference: https://politicalgraveyard.com/families/index.html