Hannah and Collin Gosselin look so grown up. On Wednesday, Jon Gosselin shared a picture of two of his sextuplets heading off on their first day of 11th grade. In the snap, the siblings posed in front of their matching cars as they smiled at the camera. "First day of 11th Grade. Good Luck Hannah and Collin. Love Dad," he captioned sentimental post. Jon, who shares eight kids with his ex wife Kate Gosselin, has custody of Hannah and Collin. The remaining sextuplets, Leah, Joel, Alexis, and Aaden live with Kate. The estranged pair's 20 year-old twins, Mady and Cara are away at college.