Chelsea's mother is the mother of Chelsea, the sister or sister-in-law to Mary Frances and the aunt of Portia as well as her two twin brothers, Richard and Dick. She also has a son, who was not invited to Chelsea's Bat Mitzvah.
She speaks to her daughter over the phone in "Bat Mitzvah Crashers," the latter threatening to fire her if she doesn't make mini egg rolls for her Bat Mitzvah. This implies Chelsea's mother works in the food industry.
Before hanging up, Chelsea states "Ugh. I love you too, mommy," revealing to the audience she was speaking to her mother.
- Despite never appearing in the show, a decent amount of information is known for Chelsea's mother, hence her inclusion as a page on The Mighty B! Wiki.