In Touch has exclusively learned that Jon Gosselin is asking a judge for joint custody of twins of twins Cara and Mady, 16, and sextuplets Aaden, Alexis, Collin, Hannah, Joel and Leah, 12.

Jon currently has visitation, while Kate has full custody. He’s also demanding to know where the Kate Plus 8 star sent their special-needs son, Collin, whom Jon says he hasn’t seen in more than 18 months.

MORE: Kate Gosselin Reveals Son Collin, 12, Is "Chugging Along"

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“So there will be a trial as soon as possible. The judge ordered it,” the source exclusively revealed. “Jon’s been waiting for this for a very long time.”

"The judge is ordering psychological evaluations of all eight kids and for both Kate and Jon before heading to trial,” the source continued. “Jon hopes the judge will meet with all the kids privately in his chambers, without Kate, to find out [the truth] and what they really want.”

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