Well, after months of wondering if the in-laws would ever talk to me again (not that I cared, but fiance would) I had my first visit with them since my wicked email. MIL and I pretty much had cleared some things up through email, but apparently FIL was still "mad". I'm not sure what he was mad about, but I was told he would not be coming back up to visit. Ever. This surprised me because she always seemed like a grudge-holder, and he seemed easy-going. In retrospect, I can see where she got over it and he didn't. She's so desperate for people to like her, I realized later, that's why she was willing to work it out. He, on the other hand, is like a child and very immature. MIL and BIL came about a month ago, but I was at work and missed them (not intentionally, really!) Well, for this visit BIL had to work, so FIL had to drive (because of course MIL can't handle a 2½ drive *eyeroll*) so he had no choice but to visit. When they first showed up he seemed a little distant, but we all went over to my mom's to swim and all went well.
Even better that they didn't spend the night!