Yes, Jon's dad did pass away, and apparently the family was close to him. I don't think they have any issues with Jon's mom, but I think she lives far away. There do seem to be some type of issues between Kate and her parents. Her brother lives just down the street from them, and the two families seemed to have a fine relationship (he and his family were seen in a lot of the earlier episoded,) but yes I think there are definetly issues between at least Kate and her parents. As far as I know, she's never specifically addressed the issues, but hints at them often. She often says how she didn't have a lot of "experiences" when she was a child, and Jon did, and that's why they want to give their kids as many as possible, and from what she's said on her most previous show, there seemed to be some issues with their wedding ect. I would love to know the whole story, just because I'm curious, but that's their personal life, and I'm guessing still some pain there, so I completely understand that they wouldn't want the world to get involved. I also kinda thought it was weird that there friends/family (Beth, Kate's brother and family ect.) haven't been seen on the show in quite a while, however they do have the younger girl who goes on a lot of trips with them, and I could be completely wrong, but I thought she was Beth's daughter?? Not totally sure, but they had also said how they were trying to concentrate on spending a lot of family time together, plus Jon I think only works from home now, so I'm sure they don't need as much help. -I also thought Jon started working for Beth's husband?? Again could be totally wrong. -Can you tell I'm totally addicted to the show

Either way, I think they do a great job raising 8 kids.