School is in session.

Indeed, Tarek El Moussa and Christina Haack are flipping out about their children’s latest milestones. The pair—who split in 2018—put on a united front as they sent their son Brayden , 9, off to start the school year.

“First day of 4th grade for Bray,” Christina, 42, wrote on a joint Aug.18 Instagram post alongside a picture of her hugging Brayden while Tarek, his wife Heather Rae El Moussa and their son Tristan , 2, pose alongside them. “New school Fresh start New adventures Let the chaos begin!!!”

Missing from the photo was Christina and Tarek’s 14-year-old daughter Taylor , who began her first day of high school. But not to worry: in an Aug. 18 Instagram Story, Heather documented the blended family’s “big day.”

“It was both kids, Tay

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