My fiance and I got engaged January 1st, 2019. We immediately started planning for our wedding scheduled for September 4th, 2020. The venue, band, church and all other details have already been booked. This month we found out that my future mother in law has been diagnosed with stage 4 lung cancer. We haven't heard back from the doctors if there is possible treatment yet. I suggested moving the date up sooner and having something smaller with just our immediate family instead of the larger wedding we had planned. We don't really know what the results are going to be but I thought it would be nice to move it up and have his mother enjoy the day before she starts treatment or becomes too ill. Seems like his siblings didn't like this idea. I don't want to offend anyone so I'm really just staying out of it at this point. My fiance and I don't know how to approach the situation considering its a very difficult one.