The former reality dad, 42, took to Instagram to pay a tribute to his May 10 babies — but posted a photo only with Hannah and Collin.
“Happy 15th Birthday Hannah, Collin, Alexis, Aaden, Joel and Leah!!!!” He wrote. “Wow I can’t believe you are 15!!! Time is flying by!!! I love you all very much. I wish you the best day ever and I hope you enjoy your birthday celebrations today and this weekend!!! Love always, Dad.”
As Radar extensively reported, Jon has custody of Hannah and Collin, while Kate has custody of the other four sextuplets and their older twins, Mady and Cara, 18.
The father of eight most recently gained full temporary custody of Collin in early December after the troubled teen spent two years in a treatment facility for behavioral issues.
Collin left treatment and returned to live with his dad around Christmas.
Though Collin and sister Hannah are clearly close with their father, an insider previously told Radar that the rest of the Gosselin children are “completely aligned with their mother.”