Cameron and Matthew

Cameron and Matthew are Squidward's twin nephews.

Parents

 * Unnamed father
 * Scarlet Tentacles (mother) (Notice: She is Squidward's twin sister)

Grandparents

 * Mrs. Tentacles (maternal grandmother)
 * Jeff Tentacles (maternal grandfather)
 * Grandma Tentacles (maternal great-grandmother)
 * Unnamed maternal great-grandfather)

Uncles

 * Squidward (maternal uncle)

Cousins

 * Unnamed 1x cousins 1x removed