To the parents in the room, would you really not tell Molly’s dad the truth?

I’m watching S5E10, where Darlene and Molly go to the concert. Jackie and Dan just let her dad go on about the lie Molly told him and then later Roseanne confronts Molly, but I’ve always wondered why the dad wasn’t told. I thought it would be way better if Roseanne confronted Molly in front of her dad, but I’m also not a parent, so I wonder what actual parents thought of this episode…