Answer
Dingell's father, John Dingell Sr., served in the United States House of Representatives for 22 years before John Dingell Jr. took over the seat. John Dingell Sr. was first elected to Congress in 1933 and served until his death in 1955. John Dingell Jr. was first elected to Congress in 1955 and has served continuously ever since. He is the longest-serving member of Congress in history.