Fry family

The Fry Family Tree

Minute Man Yancy Fry: Fought in the American Revolution; nothing else known. Enos and Mildred Yancy Fry, Sr. Yancy Fry, Jr. Philip J. Fry Philip J. Fry, II

Fry's time travel means that Yancy, Sr's paternal grandmother is his wife, Fry's mother. And not only did Fry become his own grandfather, he made his father his own grandfather as well. An infinite loop results: Fry is his own grandfather, great-great-grandfather, great-great-great-great-grandfather and so on. Confusingly, this also means that Yancy, Sr., is married to his own grandmother. This abnormality is the reason Fry lacks the Delta Brainwave.

The paternity of Mom's kids was never revealed in the original run of the series, but in "Mother's Day" she describes Professor Farnsworth as "the only man I ever loved". However, in Bender's Game, it was revealed that Igner, Mom's youngest son, was fathered by Professor Farnsworth. It is also strongly implied that the other two may have been fathered by Ogden Wernstrom.