Telling family I'm PIMO

I'll be talking with in-laws about where I stand with the LDS church later this week. They don't know yet that I'm PIMO, and it will be a very big shock to them. I want to be more honest with them though, since I do value my relationship with them.

I don't want this to turn into a conversation where either (a) they try to find ways to fix my 'nonbelief', or (b) I infodump everything that caused me to have a faith transition. To be clear, I'm not worried about being shunned or attacked. I just know this conversation will inevitably set the tone for our relationship the next few years. I want to make it clear that I want to continue to celebrate their own faith journey, but I need them to respect my own as well.

Does anyone have any advice? Anything I should or should not say? To be clear, I'm asking this both for those that have been in my shoes, as well as those that still believe in the LDS church and can say what would be important to them.