My FH and I settled on our date, church and reception hall this past weekend and I texted a few out-of-towners and my best friend (who I intended to have as my MOH) so they could know ahead of time. She then told me that her long-time boyfriend's sister (I'll just say SIL) wants to get married on the same day but they haven't scheduled their venue/reception hall etc. She is also in the running to stand up in that wedding as well but hasn't been formally asked. She expressed that she hopes her SIL ends up picking a different date since it seems like they're not very organized with their planning. I'm not at all close with her SIL and it would just cross so many lines if I were to get in contact with her and ask her to switch her date.
The selfish part of me wants her to just go to mine since I just about have everything locked down. I've even been considering picking the following weekend, but of course, I don't want to run into the possibility of having this exact problem come up again if her SIL doesn't get the date/venue she wants. She's very close with her SIL and at the end of the day, it's ultimately unfair to her that she'll possibly be forced to choose between the weddings of 2 people she deeply cares about.
We're visiting our reception hall Wednesday to finalize the dates/packages and we were planning to finalize our bridal party and start asking people over the next month or so. I really just want to lock in our date but I'm heartbroken that my best friend may not be able to be with us if we do that. Any advice would be greatly appreciated