I never grew close to my husband's offspring from his first marriage. They lived with us f/t as their mother wished to further pursue her career, instead. We were always mutually respectful and kind, we just didn't bond on any deeper levels. I had longed for a close family vibe like I never had, but it simply wasn't meant to be. We are also polar opposites in our interests across the board, and my life experience, when discussed, seems extremely non-interesting to them based on their responses and can quickly clear a room. lol
I finally grew tired of the mental exhaustion and physical discomforts of trying to please everyone else as they steadily, yet very unintentionally, tripped every trigger I ever knew. They've long since moved out on their own, but then I had to figure even more creative and comfortable ways of getting through the visits and such as we moved into a much smaller space. I'm also very sensitive to artificial anything, be it foods, beverages, feelings, fragrances, etc. and have to very carefully navigate self when around others, especially in my own home where I feel safe the rest of the time, which I have to respectfully remember is their childhood home, as well.
I participate only on the level I'm healthily able, which means more often than not, I'm simply a non-participant in the actual event, be it a formal milestone gathering or a family meal. I was lovingly referred to as the phantom fiance when we were engaged since I rarely attended things. I plan for outings when they plan to visit more often than not and have no qualms about staying comfortably in my safe space at home without interacting when they're here. Rather, I participate prior to their arrival by contributing food stuffs, doing the behind the scenes stuff like shopping or planning their outings if they need tickets, or gifts, or a dish for a potluck meal or whatever. Things that help the hubby help make it pleasant for them, if possible. However, if it's a random unplanned or unannounced visit, participation on any level isn't guaranteed.
The library, nature, a favorite cafe' with vegan options and free wifi, a good book in a sunny spot at the park, etc. are some of my favorite getaways. My husband has become more understanding and accommodating as the years go by in realizing the depth of my discomfort and he tries hard to plan outings, meals, and things away from the house to better help me not have to deal with it. Thank goodness, because my sensitivities have steadily increased with my change in consumption choices, so it's been a progression of different levels of discomfort along the way, which adds even more chances of misunderstanding and painful awkwardness. Being highly sensitive and different from the rest makes simply existing quite a challenge, even in the spaces we usually feel safe. Hoping it goes smoothly for you. Sending you lots of "you've got this" and "give self permission to not participate, if need be" vibes.