Where has the time gone? Jon Gosselin wished his sextuplet children a happy birthday via Instagram on May 10 and shared a few photos of himself with the two kids he has custody of — Hannah and Collin Gosselin.

“Happy 15th Birthday Hannah, Collin, Alexis, Aaden, Joel and Leah!!!!” the former Jon and Kate Plus 8 star, 42, 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.”

Jon shares the sextuplets with this ex-wife, Kate Gosselin. She has custody of the other four, as well as the couple’s older daughters Mady and Cara. Jon actually filed for full legal and physical custody of Collin on October 24, and Hannah has been living with her father since the spring of 2018. It’s unclear how much Jon gets to see the other kids, and it doesn’t sound like he’s a part of the weekend birthday celebrations he mentioned in the caption. Maybe this Instagram post is his only way of sending birthday wishes?

In any case, people in the comments loved Jon’s message and were in awe that the little kids from Jon and Kate’s former reality show are all grown up. “Happy birthday to your adorable kids … who will forever be 3 years old to us!” one person wrote. Another responded, “How are they possibly 15?! Time flies! I hope they enjoy their special day!” Others mentioned that they hope Jon gets to see the rest of his kids, too. “Hannah is beautiful and Collin is handsome,” one fan replied. “They seem happier with you. I’m happy for you John and I hope the other kids come around to visit.” We hope all of the kids really enjoy their special day and that they see their dad’s lovely message.

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