Christina Haack and Tarek El Moussa's children appeared on "Flip or Flop" throughout their childhoods, returning to HGTV screens on "The Flip Off."

Flip or Flop has been a powerhouse franchise for HGTV going back more than a decade now, continuing via spinoffs even after Tarek El Moussa and Christina Haack divorced and the original series ended.

Christina Haack invited ex-husband Tarek El Moussa's mother to be a guest judge on their HGTV series 'The Flip Off'

The duo were joined by Heather’s husband and Christina’s ex, Tarek El Moussa, in a new promo for their HGTV series ‘The Flip Off’

Christina Haack and Tarek El Moussa have been bringing celebrity relationship drama to HGTV since 2013 when they were still a bickering married couple on Flip or Flop, and the drama continues today. However,

HGTV star Christina Haack 's bitter divorce from Josh Hall took center stage in the premiere episode of her new show, "The Flip Off," which saw the starlet candidly explaining what led to the breakdown of her marriage.