These are the people related to Dr.John A. Zoidberg they all hail from the Planet Decapod 10 but there are some that call the planet Earth as home.
“Zoidfarb is John A. Zoidberg's cousin. He is mentioned numerous times by Zoidberg and seems to...Zoidfarb
“Norm Zoidberg is the father of John and Norman. Appearance "That's Lobstertainment!" (mentioned)Norm Zoidberg
“Sam Zoidberg is the mother of John and Norman, as well as Harold Zoid's sister. Appearances...Sam Zoidberg