Mother-in-law fixed the wedding date.

My mother-in-law's wedding date must be an auspicious day calculated by fortune telling or something. This time can be modified. Ask your mother-in-law and discuss with her whether you can change it.

Although marriage is an important ceremony, to be honest, it is also for others to see. If you want to get married, it's as simple as registering.

Your brother, the relative you grew up with, how can you live without him? Your brother will be sad if you get married like this, right? I don't think your parents prefer boys to girls. Your daughter's marriage is certainly important, but it makes sense to marry someone important in your own life.

Talk it over with your mother-in-law. I don't think she would be so unreasonable.