Definition: In the context of family history and genealogy, "stepgrandfather" refers to a male descendant who is older than his or her grandparent(s) but younger than their father. This can be important in understanding one's lineage and heritage, as it indicates where one's ancestors came from and how they were related to each other within the same family. For example, if your ancestor was a stepgrandfather of your great-grandmother, you would have a line back to her mother who is