Jon Gosselin says he's so out of the loop when it comes to his son's whereabouts that he doesn't even know where the 12-year-old is now.
Collin Gosselin is in treatment for unspecified "special needs" following years of behavior struggles, Kate vaguely revealed this summer.
As far as additional details, we're in the dark. So is Jon.
"I have an idea where he is but I don't really know where he is," he tells ET's Jennifer Peros, alleging that Kate is keeping secrets from him.
While Kate "says Collin is in a special school for special needs kids with behavioral problems,” Jon claims he has been told otherwise.
By law enforcement officials, no less.
Collin is conspicuously missing from the new Kate Plus 8 trailer that debuted late last month, and won't be appearing in the new season.
He's also been MIA from interviews, magazines and other promotional materials in which Kate has been accused of exploiting Collin.
So where does Jon fit in to all this?
Kate currently has full legal custody of their kids, twins Cara and Mady, 16, and sextuplets Aaden, Collin, Joel, Leah, Alexis and Hannah, 12.
Jon has partial physical custody, but says he hasn't seen his kids all together in years, and Collin specifically in over a year and a half.
That's when he claims Kate took him out of the private school he was attending without consulting him, keeping his whereabouts secret.
"I mean, I ask but she doesn't tell me," he told the TV program about Collin's current location. "She doesn't answer any of my texts."
Jon claims that Collin's brothers and sisters are also not in touch with him, and either have "no idea" where he is or aren't telling him.
As a result, he says he's going to court.
"They know their mom told them that he has behavioral issues," he says, adding that the boy "seemed fine" to him the last time he saw him.
Then again ... that was awhile ago now.
He describes Collin as "really smart" and "incredibly intuitive ... I could see my kids getting annoyed with that because he's the smartest."
"He does this, and he does that, and he always wants it his way," Gosselin also observes. "He's very particular, which could be bothersome."
"But, he's very loving too."
Regardless, if you read between the lines, Kate admits abusing Collin in the past and isn't exactly coming across well in any of this.
In August, Jon said he was extremely upset at Kate's new People cover story and the comments she made pertaining to their son.
"[There's] a fairly fluid diagnosis," she said of Collin's issue, "but he needs to learn certain strategies to help him deal with things."
"This has been a struggle we've had for a very long time, and it's one I've dealt with on my own," she added passive-aggressively.
"I love my children very much," Jon fired back, bristling at that quote. "I've always been there for them and I always will be."
To imply otherwise, he says, "it's shocking."
On many levels, this whole saga is.