Читать книгу Who Do You Think You Are? Encyclopedia of Genealogy: The definitive reference guide to tracing your family history - Nick Barratt - Страница 26

The direct line in your family tree is made up of all the people who have been biologically crucial to your creation. Therefore they would include your parents and your grandparents, but not any of their siblings and other descendants – these people are your extended family. Each time you move one generation further back, you need to add ‘great’ as a prefix. Therefore the parents of your grandparents are known as your great-grandparents, and the parents of your great-grandparents are your great-great-grandparents, and so on. Every time you search for another generation in your direct line you will be looking for twice the number of people as the generation that came after that. This is because you have two parents, who each have two parents, so that you have four grandparents. These four grandparents have two parents each, which means you have eight great-grandparents, and then sixteen great-great-grandparents. As you work further back than this, you might find it easier to shorten this description to ‘2 x great-grandparents’.