Bridget (Kaley Cuoco) is the popular and fast-talking oldest daughter and Kerry (Amy Davidson) is the moody and environmentalist middle child.
While the two sisters share a room, they regularly are at odds with each other and their father, with Kerry offering biting sarcasm and Bridget trying to talk her way out of punishment.
Following Ritter's death, ABC announced that the show would continue after a hiatus, and would incorporate the death of Ritter's character.
The three new episodes that Ritter completed were aired with Sagal introducing them.
The two get a lion's share of airtime, as they are the titular "teenage daughters" whom Paul is trying to protect.