Kim Plath is willing to talk about her late son, Joshua , but chatting about him with son-in-law Zac Wyse is anything but fun. “I’m aware that Zac likes to have really deep conversations, but I don’t know that ‘excited’ is the word I would pick,” Kim, 53, tells the cameras in Us Weekly ’s exclusive sneak peek at the Welcome to Plathville season 8 finale, airing Tuesday, June 16. Despite being uncomfortable, Kim sits down with Zac, 24, who tries to explain how “excited” his wife, Lydia Plath , is to “just be able to share this with her family who experienced it with her.” Zac reveals it’s “awesome” and “great” that Kim is willing to talk to not only Lydia, 22, but everyone else about Joshua, after Lydia claimed her parents never spoke about him once he died. (Joshua died in 2008 when he was 17 months old following an accident on the family farm in which Kim was driving and ran him over.) Kim Plath and Zac Wyse. TLC; Instagram “I’ve given up trying to fix...