As for what the former couple's 19-year-olds are up to next? Well, Collin Gosselin, who alongside sister Hannah Gosselin lives with their dad, shared a heartwarming Instagram post about his plans for this next chapter in his life: He's enlisting in the military.
"Next stop Parris Island," he wrote, referring to the site of the Marine Corps Recruit Depot, "and soon after I will be studying Mechanical and Industrial Engineering in college! Can't wait!!!"
In his June 22 message, Collin also expressed gratitude toward the people who helped him on his journey—including Hannah, who he posted a snap with in their graduation robes.
"I want to first thank my amazing sister, Hannah, for standing by me and supporting me, she is my number 1," Collin wrote. "I would like to thank my dad, who has taught me so much about running into hard times and moving past them, about resilience. Thank you dad for always supporting my decisions, and having my back when I bite off more than I can chew."
Collin further noted the impact Jon's ex-girlfriend Colleen Conrad has had on his life. "I'd like to thank Colleen for rooting for me day in and day out," he wrote. "When you think of someone you want by your side, you think of Colleen. And as I've told her many times, she is my motivator for being successful in this world."
And while his next chapter is taking him to the Marines, Collin also expressed his thanks to the Army officials who helped him find his next move.
"And last but not least I would like to thank my Army Junior ROTC instructors, First Sergeant Dolan, Sergeant Gonzalez, and Major New," he added. "Three of the realest, most humble, and genuine leaders I have ever met. Collectively they have taught me some of the most valuable lessons that I will carry by my side for life. No hate towards the Army, but the challenge of the Marine Corps just appealed to me more. Just thought I'd clarify that."
Collin, Hannah, their sextuplet siblings Leah Gosselin, Alexis Gosselin, Aaden Gosselin and Joel Gosselin, and their older twin sisters Mady Gosselin and Cara Gosselin, 22, rose to fame as children on their parents' TLC reality show Jon & Kate Plus 8, which aired between 2007 and 2009. Following the couple's divorce the latter year, the series became Kate Plus 8 until it ended in 2017.
While Kate obtained custody of all the former couple's kids after their split, Hannah later moved in with her dad, who later obtained full custody of Collin.
And while Collin remains estranged from their mom, Jon confirmed that Kate also attended his and Hannah's graduation on their daughter's invitation. "We saw each other, but there was a whole football field between us," he told People earlier this month. "I talked to Hannah and Collin before graduation to make sure that it was gonna be cordial."
Jon told People in an interview published June 9 that Kate also attended Collin and Hannah's graduation after their daughter invited her. "We saw each other, but there was a whole football field between us," he said. "I talked to Hannah and Collin before graduation to make sure that it was gonna be cordial."
Meanwhile, while Jon remains estranged from the other four sextuplets and the twins, who graduated college this year.
"I had eight graduations this year," he explained. "I only attended one. The only kids I see and talk to are Hannah and Collin. So I've been pretty much estranged from Mady and Cara for nine years."
But he's not closing the door on a possible reconciliation with his other children. "Maybe we'll develop a relationship in the future, but yeah. I can't put all my eggs in one basket like I used to and then be upset about it."
See the Gosselin kids' journeys over the years below: