Arbor's family is shown in The Arborians. No matter how distant the relative (for example, Arbor's wife's brother's cousin), Arbor seems to know them.
Every member of Arbor's famly-and probably every Arborian- has a name that is a variation of Arbor (Arbor, Arbora, Arboria, Arbor Jr., Arbor Jr. Jr., Arbie).
Arbor- The most known Arborian in Chowder. Arbor has green leaves.
Arbor's Wife- Red leaves, twig nose.
Arbor's Wife's Brother- Yellow leaves, expert on interior design
His cousin- Purple leaves.