Kermit grew up with thousands of siblings, and has talked occasionally about other members of his family. His childhood adventures were chronicled in the 2002 video Kermit's Swamp Years. Kermit also has a nephew named Robin.
Miss Piggy insists that she and Kermit were married in The Muppets Take Manhattan, and that they're very happy. Kermit disagrees, claiming that it was just a movie and that in real life, they have a "professional relationship" (meaning he thinks they're professionals and she thinks they're in a relationship).
Kermit's most well-known catchphrase is "Hi-ho, Kermit the Frog here!" He typically introduced acts on The Muppet Show by waving his arms wildly and shouting "Yaaaay!" (a technique he learned from his old acting coach, Mr. Dawson).