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M.J. Delfino (short for Maynard James), is the son of Mike Delfino and Susan Mayer. He is played by Mason Vale Cotton and has appeared in six episodes to date.
Parents: Mike Delfino & Susan Mayer
Siblings: Julie, Zach
Grandparents: Nick & Adele Delfino, Sophie Bremmer, Addison Prudy
Other Family: Morty Flickman, Claire Bremmer