I've been with my fiance for the past 5 years (both men), and he has 2 kids: ss10 and ss8. My relationship with the oldest has always been great, he's my little buddy. He spends more time with me than with my fiance. My relationship with the ss8 changed when we got engaged a couple of months back. 

He's veen very cold and distant with me and my fiance. He will sometimes walk past me withouteven acknowledging me, or he won't answer when I'm speaking to him. Unlucky my fiance has always had my back and calls him out on it and tells him when an adult is speaking to him, you have to acknowledge them and respond to them. I've brought this to my fiance attention with our ss8 behaviour has changed and he has agreed that something is up. He does ask him if everything okay and he just says that he's fine, he's started asking strange questions, such as how we're going to have more kids(we don't), or the one that really got me was "whose the woman in the bedroom?!!".He's taken an interest with our sex life. My fiance will tell him that it's an issue between adults and that all he needs to know is that people express love differently  to different people(or something like that). I'm all down for a kid being curious, but this coming from an eight year old???!!!!. It is his voice, but it sounds like bm's words. 

Bm has hated me ever since my fiance told her about me. I've been called a gold digging b**ch- my fiance is a corporate attonery, but guess what I'm a pharmaicst who owns 2 pharmacys. She's called me a home wrecker- she was the one who cheated on my fiance with her best friend's husband(real classy), or she says that I'm too young for him- I'm 26 and he's 36. It's only 10 years. I've seen marriaged couples who are 18 years apart, or she says that this will harm the kids- it's not like they got divorced and BOOM he was into men (I also had a girlfriend before I met him). We met at the gym one day and just got to talking. Which lead to us hanging out more. It took us a year to realize that we had feelings for eachother, we dated for another year and I wasn't introduced to his kids until another year had passed. Even then we took things slowly for their sake too. I went from "dad's friend" to "dad's special friend" to "dad's boyfriend". When he did tell him about him and I dating they were okay with it. Both of them took it pretty well. Even when we got engaged, they helped when he proposed to me. So this new behaviour coming from ss8 is really out of the ordinary.

I was hoping maybe the wonderful ladies there could help me out with this problem before it gets out of hand.