Jon & Kate Plus 8 sources—five of them—who confirm dad Jon had an affair with his “mystery woman” does not equal good news for the reality show couple. Us even spoke to two relatives, including alleged mistress Deanna Hummel’s brother, who says at the house he shares with his sister, the pair would “pretty much stay locked away like two teenagers. It was weird. He's a grown man.”
Things got awkward when big brother was listening: “No one wants to hear his sister having sex, let alone with a married dude who’s almost twice her age and who has eight kids and a maybe-crazy wife. Ick.” Jon met Deanna in mid-January, he says—and Us has video footage of a man it claims is Jon sneaking out of Deanna’s home on March 13.