'Mad Men' Creator Discusses Casting His Son As Creepy Neighbor Kid

(WARNING: The following may contain spoilers for both the current and past seasons of "Mad Men." If you're not all caught up, you know where the back button is...)

Throughout the five seasons of AMC's "Mad Men," it wouldn't be entirely accurate to say that Glen Bishop has "grown up."

Truthfully, he's really just grown a little creepier. Take that into consideration when creator Matthew Weiner claims that the actor making him so consistently unsettling - that would be Weiner's son, Marten - was "the best person available for the role," according to a Weiner interview with NPR recounted today by The Huffington Post.

"I would have never thought of him if he wasn't my son," Weiner said. "It was actually someone else's idea, and I was counseled against it from all the complciations that could happen from him failing at that job. But he really nailed it, and he's a really good actor."

Marten was down for the job from the moment his dad approached him when the boy was 10 years old, Weiner said. Of course, his first impact upon audiences was that uncomfortable moment staring a hole in Betty Draper (January Jones) as she sat on the toilet, then later asking her for a lock of her hair. At that age, Weiner recalled Marten telling someone his favorite perk of the job was simply daily lunches with his dad.

Marten's creepy neighbor kid has taken up pitching woo at Don and Betty Draper's daughter Sally, including going AWOL from boarding school just for an afternoon with her at the Museum of Natural History.

"Who knows if [Marten] even understands the difference between this job and other jobs, but it's beautiful to have him there, and I work a lot," Matthew said. "He is part of the cast, and the reason I had him do it is because he's good at it. The fact that I identify a lot with Glen was confusing to him."

In the meantime, though he's the boss' son among possibly TV's most talented cast, there's no quarter given to Marten.

"I treat him the same as any other cast member," costume designer Janie Bryant told GQ recently. "I tell him to pull his pants up just like I do every one else."