A quick definition of ascendant:

Ascendant: A person who came before you in your family, like your parents or grandparents. They are also called ancestors. Other relatives like aunts or uncles who are not direct ancestors are called collateral ascendants. Lineal ascendants are blood relatives in the direct line of your family tree, like your parents, grandparents, and great-grandparents. Ascendant can also refer to the passing of property or wealth to an heir in the ascending line, which means going up in the family tree.