In a similar fashion, grandparents are grandfather and grandmother.
– the father of your father
– the son of your great-grandparents
– and the husband of your grandmother.
– the mother of your mother
– the daughter of your great-grandparents
– and the wife of your grandfather.
Remark: A person can have grandparents and great-grandparents from both directions, mother and father.
Now, let’s look at the blood kinship of the different members of the royal family from the angle of the grandparents. Check the illustration below!