1. This local custom is understandable.
There is such a thing in Guizhou, because the wedding date is set in advance, but the bride can't attend because of physical reasons. It will be very troublesome if the wedding date is changed casually. After all, the guests have informed and the hotel has been found. In order not to affect the wedding date, the bride's younger brother will marry instead of her sister, so she painted exquisite makeup, which looks very calm, and there is such a habit in the local area, unless two people break up, under normal circumstances. The fixed wedding date must not be changed, so I got married with my younger brother. After all, it is only a formal substitute. I think it is understandable that my sister and brother-in-law actually lived.
Secondly, I think the wedding is a formality, but it is more meaningful for the bride and groom to attend in person.
Marriage is a witness to the feelings of husband and wife. With the blessing of relatives and friends, the two vowed to grow old together and spend a lifetime together. When they live in the future, they can also recall their original vows and cherish their marriage more. So I think it is very formal for the bride and groom to attend this ceremony. Only when two people have good memories can they promote their married life. It's a bit formal to let the younger brother marry on behalf of the older sister. I don't think it's necessary. Might as well change the wedding date.
Third, this custom can also show that everyone attaches importance to the wedding.
However, this custom can indirectly reflect that the local customs are relatively simple. Everyone thinks that the agreed thing is irreversible. If there is really no way to achieve it, it can be replaced by other forms, not cancelled. Perhaps this wedding was also discussed by parents and relatives of both sides, and I believe I will get everyone's blessing.