Which three generations are the direct three generations?

Three generations of immediate family members include: myself, parents, grandparents, grandparents, children and grandchildren.

Calculation of lineal blood relatives:

I am a generation, and my parents and grandparents are three generations.

I count myself as one generation, the next generation, and my grandchildren as three generations.

Calculation of collateral blood relatives:

From two collateral relatives to two homologous blood relatives, it is a generation. If the numbers on both sides are equal, the numbers on either side are their algebras. If the numbers on both sides are not equal, algebra is a larger number.

Collateral consanguinity within three generations is a concept relative to lineal consanguinity, which refers to relatives who have blood relations with themselves within three generations. Lineal blood relatives are relatives who have direct blood relationship, that is, relatives who have given birth to themselves and their descendants. Both mother and father are included.