FI and I have been together for 8 years...
His sister and I get along wonderfully, and I spend a lot of time with her little girl. She is one of my BMs and her daughter is our FG. I like his dad a lot and we get along very well... his mom is an incredibly difficult person and has never been friendly or welcoming to me. We are nice to each other but we are in no means close, and it is still very awkward if we are in a room alone.
I'm having trouble wanting to include them on much of the planning process. We have ran little things by them - invites, venue, date, etc. - but they haven't been actively involved and haven't showed a ton of interest. I'm getting ready to start dress shopping and both of my parents, my sister, and my brother will accompany me. I feel like that is a pretty full group already, so I don't plan on inviting future MIL or SIL, but I will have them come with me to my first fitting. We are also getting ready to go to our food tasting. My parents will attend with us because they are footing the bill for food and drinks at the reception. I really don't want FIs parents there because I know they will be negative the entire time.
I have a feeling this will come back to bite me and later on we will find out that they are upset.... am I totally wrong to not be including them on these things?? I just want the planning process to be as fun and as stress-free as possible.