Having common ancestors is a term used to describe two or more people who share a common ancestor. The term can be used to describe family members, such as siblings, cousins, and other relatives, or it can be used to describe two people who are not RELATED but have a common ancestor in their family tree. In the crossword, the solutions 'AKIN' (4 letters) and 'RELATED' (7 letters) both refer to having common ancestors.