1. Traditional concept: In some cultures, grandparents may be regarded as the elders in the family, and their status and role may be regarded as unsuitable for the wedding of the younger generation. This concept may have originated from the past, when the family structure and relationship were closer and the roles and responsibilities of family members were more clear.
2. Physical condition: If grandparents are in poor health, they may not be able to travel for a long time or celebrate for a long time, so they cannot attend the wedding.
3. Cultural differences: Different cultures may have different understandings of the roles and responsibilities of family members at weddings. In some cultures, grandparents may be regarded as important members of the family, but for various reasons, they may not attend the wedding ceremony.
In a word, in many cultures, grandparents can't attend their grandchildren's wedding not because they don't pay attention, but because of traditional ideas, physical condition and cultural differences. However, with the changes of the times and family structure, this traditional concept is gradually changing.