"We'll meet Robin's new stepmom, who wants to sing at her wedding," says executive producer Carter Bays. "And Robin's mom, whom we've said almost nothing about, will also be a factor, whether we meet her or not. We'll be exploring why Robin hasn't talked to her. Her personality will help explain Robin in the same way her dad's did."
Bays adds that, after HIMYM's series finale, he's not ruling out the possibility of a relationship-themed spinoff.