"Oh my God, we have such a crazy sibling dynamic," she tells PEOPLE of her relationship with Oliver, 48. "We have a whole podcast about it!" She also reveals that her older brother is "still mad ...

He coached the boys basketball teams at Mansfield, Walpole, Abington, and spent his final 12 seasons at Oliver Ames, where Jen is now the junior varsity girls basketball head coach and assistant ...