COLLIN Gosselin is writing a tell-all memoir about his estranged mom Kate's alleged abuse and affair.

Collin, 21, has been estranged from his mom ever since he spent 22 months in an institution as a pre-teen.

His dad, Jon , 48, was awarded custody of Collin, as well as his sister Hannah, while Kate had the twins and remaining sextuplets in her care.

In an exclusive interview with The U.S. Sun, Collin revealed he is in the process of writing a tell-all book about his mother's alleged abuse as a child .

"I have always wanted to write a book for a long time," Collin told The U.S. Sun. "All the way back to institution, I was thinking about the events of the show and institution.

"You just think about how institution was and I remember so many details from it. I just remember life ex

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