I don't know if this is in the right forum or not.
My fiance has 2 kids, they go back and forth between him and their mother (week to week).
We got engaged in October, and this week tried easing into the discussion with the kids. I thought I got along with them great. We started off with a discussion like me moving in some day, and the girl (10) began to cry.
She said she doesn't know how she feels about it, because her mom gets sad / angry when she talks about me to her, and her dad is sad without me around. She then asked her dad if he would be sad if I didn't move there to be with him. That was the gist of the conversation, and it wasn't really explored any deeper than that. We ended with saying it won't be for another year or so, so we can talk more about it closer to the time.
Since that talk, I've noticed that she has been a bit cooler towards me, and doesn't seem like she knows how to act (neither do I, truthfully!).

I was hoping someone had some insights / thoughts on how to pursue this further...I mean we haven't even talked to them about us getting married, when do we broach that and how, now that we know what her potential reaction will be?

Thanks in advance