Jared Gilmore (aka Little Bobby Draper) is leaving Mad Men to star in an upcoming series, Once Upon a Time.

For his parting words, the 11-year-old actor warns people about his TV mom, January Jones. He tells TV Guide that his successor should “be careful around January. She’s not as approachable as the others. She’s really serious about what she does.”

And how about the rest of the cast? “Everyone else is so nice.”

John Slattery came in defense of his co-star, explaining that Betty Draper’s character is not the easiest to work around. In the latest season of Mad Men, Betty Draper plays a bitter divorcee who just got married to her new husband.

“It’s an intimidating character,” Slattery explains to E! “I mean, that’s the character. Betty Draper is an intimidating woman I suppose, if you were a 7-year-old boy [or] her son.”

Good luck to Jared…and to the future Bobby Draper!