Sophie Hunter is the maternal grandmother of Debbie and Eliza Thornberry and Marianne's mom.
She was voiced by the late Betty White.
She is first seen in the anniversary Where she and Frank celebrate their wedding anniversary.
She is then scene in Family tradition where the Thornberrys can’t make it in time for Thanksgiving so they call her on the radio.
The origin of Donnie is when she comes over for Donnie’s birthday and tries to find his parents but they died. then she gets invited to a tribal dinner with Debbie.