Sluggo the Leech is Gary's father. He's the uncle of Sam and Patrick. His brother is Herb.


His spouse is probably a snail, that's why their only son is a snail.


  • It is unknown how a star and a snail can reproduce, but since the SpongeBob series is fictional and that Sluggo is either a leech or a slug since slugs are related to snails, anything is possible.