Question: is jesse danny's brother on full house

Answer: No, Jesse Katsopolis (portrayed by John Stamos; the character's last name in season one was Cochran, but was changed reportedly due to John Stamos wanting his character to better reflect his Greek heritage) is Danny's brother-in-law, Pam's younger brother, husband of Rebecca Donaldson and father of twin sons Nicky and Alex. Born Hermes Katsopolis (as revealed in the season five episode ``The Legend of Ranger Joe''), he was named after his great-grandfather, who in turn is named after the Greek god of swiftness. However, he did not like his birth name, as other kids teased him for it; so when he was in kindergarten, he begged his parents to have his name changed to Jesse, thinking that one had to have a ``cool name'' to be in the in-crowd. As an adult, he was more confident with his true name, telling the girls about the Greek god of speed, and how his great-grandfather saved a village from a volcano, but still goes by Jesse.