1. Generally speaking, after the death of an old man, a grandson can't get married for three years. This is because in the traditional culture of China, after the death of an old man, the younger generation needs to be filial for three years to show respect and memory for the deceased. If the younger generation gets married during the mourning period, it may be considered as disrespect for the deceased.
2. The local customs are different, so the time of mourning for the elderly at home is different. In some places, it is generally a funeral year, during which you can't get married, because a year is a relatively complete day.
In some rural areas, weddings are held within 100 days after the death of relatives, or three years later. However, during this period, it is best to only get a license to hold a wedding, and it is not a big deal. When the time comes, you can make up the wedding.
Generally speaking, whether you can get married during the funeral depends on different local customs. According to traditional customs, you can't get married for three years, but some places no longer follow these rules. If you follow these regulations, you can consider only getting a marriage certificate, not holding a big wedding, and waiting until the funeral to reissue the wedding.