Is this someone out of a kid's movie/book?
DS(4) keeps talking about Jack Ferber which is quite sweet, I'm just wondering if he's completely made it up or heard it somewhere?
He'll run around the house pretending it's a race saying "here comes Jack Ferber, he's overtaking everyone, Jack Ferber wins!" Or "when I'm bigger I'll play football and Jack Ferber will be on my team"
A quick Google didn't bring up anything kid-related but who knows!