Dylan Efron is coming to Ashley Tisdale French's defense amid her ongoing mom group drama. Dylan, 33, whose older brother Zac Efron starred in the High School Musical movies with Tisdale French, was quizzed about the topic during an appearance on Watch What Happens Live With Andy Cohen on Wednesday, January 21. "I try to stay out of that, so I don't know too much," Dylan said. "All I know is, Ashley, since I was a kid, she's been so sweet to me. So I can't envision her doing anything malicious to the mom group. Hopefully it's just a misunderstanding.