Do grandchildren have anything to do with grandfathers?

Grandparents and grandchildren are immediate relatives of grandparents' daughters. Grandpa and grandson are also it runs in the family, but they are collateral blood relatives. So there is a blood relationship between grandchildren and grandfathers.

Grandpa, also refers to another title of grandpa. Grandson is my grandfather's daughter. After marriage, she should be a child shared by her daughter and son-in-law, and it is a collateral surname. Therefore, grandson and grandfather (that is, mother's father, also called grandfather) are actually not immediate relatives, but collateral blood relatives, and there are three generations of collateral blood relatives from top to bottom.