It appeared from his Sunday, July 22 Instagram photo of the big family reunion/birthday party that the Little People, Big World star's kids showed up but his ex-wife Amy wasn't there!
Matt captioned a shot of a large group of Roloffs, with Caryn posing by his side and Ron in the center, "The best weekend celebrating my dads 80th. Can the diehard Roloff fans identify everyone In the clan? Hint: my sister Ruth has 3 daughters on married. My brother Sam has 3 kids... Audrey and Ember are there in spirit. Try to guess who's who."
Ron had his hand on Caryn's shoulder in the sweet picture, showing her continuing closeness to Matt, 56, and his family.
The picture also showed all of Matt and Amy's four children were there—sons Jeremy, Zach (with wife Tori and their baby son, Jackson), and Jacob (and his fiancée Isabel), and even reclusive daughter Molly! Jeremy's wife Audrey and daughter Ember weren't in the photo.
Amy, 53, was missing and Matt didn't mention her in the post -- or in a previous photo caption.
From Amy's Instagram posts on Saturday, it looked like she was spending the weekend with her friends and dog.
Before sharing his photo of the family reunion, Matt showed Ron holding and smiling at his great-grandson, Jackson.
Matt wrote as the caption to the Saturday, July 21 post, "celebrating my dad (pappa Roloff's) 80th Birthday. My dad, a huge positive role model in my life... so glad he's still going strong so I can continue learn more life lessons from him... and Jackson can learn some too!"
Matt's folks Ron and his wife Peggy have rarely appeared on TLC's LPBW.
After Matt and Amy finalized their divorce in May 2016, his parents remained close to their grandkids.
The older Roloff couple reportedly live in California while most of the Roloff family remain in Oregon—although, as RadarOnline.com has extensively reported, Matt and Caryn bought an Arizona home together as a love nest.
They've been spending lots of time in the desert as well as in Oregon recently.
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