Mayor Bill de Blasio and first lady Chirlane McCray trudged door-to-door in Iowa last month to campaign for Hillary Clinton, but their two college-student children appear to favor her opponent for the Democratic presidential nomination, Bernie Sanders.

McCray, in an interview published Wednesday on the feminist blog Jezebel, characterized conversations about presidential politics with Chiara and Dante de Blasio, 21 and 18, as “ongoing.”

Asked more directly if her children prefer the U.S. senator from Vermont over the former secretary of state, McCray laughed and said, “Uh, well, it’s possible.”

Spokeswomen for de Blasio and McCray did not respond to requests for elaboration on the children’s’ preference. Clinton has struggled to woo young voters who have been gravitating toward the more progressive Sanders.

McCray in the Jezebel interview also appeared to contradict de Blasio on the proposed closing of the violence-plagued Rikers Island jail facility. He has voiced doubts about its practicality and cost, but McCray called it a “great idea” in part because the facilities don’t provide adequate mental health care.