Beatrice Jean Hart (née Bryant) is Jenny's mother and the grandmother of Violet. She tends to bicker with her daughter Jenny but still cares for her. She is voiced by Maya Rudolph.
"Miracle on Culpepper Slims Boulevard" shows Betty's middle initial as B. on a piece of mail that she receives.
Betty is a fiery, spunky lady. She tends to have sass in her interactions with everyone around her. Even with these things, she does have a heart for the ones close to her.
In "Jenny Unfiltered," her maiden name is rendered as Betty June Bryant, but later her full maiden name was revealed to be Beatrice Jean Bryant in "Mega-Lo-Memories: Part Deux." In "Miracle on Culpepper Slims Boulevard," a letter reads "Ms. Betty B. Hart" which is incorrect as she uses Hart as her married name and her middle name is either Jean or June.