Diane

Diane is a supporting character in I'm Sorry. She is played by June Squibb.

Biography
Diane is the grandmother of Opal, one of the children in the same class as Amelia. She is in the same dance class as Andrea, and has a low opinion of her due to her swearing. It is suspected that Diane is the person who outed Melissa Waters as the former porn star Sienna Sparkle.