A family tree is a simple chart representing family relationships in a conventional tree structure form. The more etailed family trees used in medicine, genealogy, and social work are known as genograms.
Trivia about family tree
It's the common name for a generational chart of ancestry
(Cheryl of the Clue Crew standing in front of a chalkboard) It's the 2-word term for this "arboreal" representation
At Ancestry.com you can build your own one of these & find out if you're on a main branch or just a twig