<P> 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 . </P>
<P> 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 . </P>
who is jesse to danny in full house
who is jesse to danny in full house
brother - in - law
brother - in - law