I thought the show is set in Missouri? If it is, then Missouri's age of consent is 17, and I'm pretty sure Daphne is canonically 16 in season 1, but that was a long season so I could be wrong. As for other girlfriend, Jeff had been having an affair with Emmet's mom, so that just adds to the level of creepiness even if…

I would agree with ABC Fam that Jeff is a bad boy seeing as he willingly committed statutory rape with Daphne and was her boss and all.