In the new issue of Us Weekly (on newsstands Wednesday), five people close to the situation - including two relatives of the other woman - confirm that Jon & Kate Plus 8 dad Jon Gosselin, 32, has been having an affair with third grade school teacher Deanna Hummel.

The most explosive blow-by-blow details are revealed by Deanna’s older brother - and roommate - Jason, who tells Us Weekly that he is speaking out now to set the record straight and to protect his naive sister.