Most of us understand the concept of finding our Ancestors, or working back in time to develop a pedigree. There is another type of research that takes an ancestor, say a 2nd great grandfather, and begins to look forward in time at all the descendants flowing from this person. This is called "Descendancy Research".
The image to the right is a diagrammatic representation of all the descendants that came from just one 2nd great grandparent. It's amazing to see how quickly the number of descendants grows over a few generations. If we went back 4 generations and if each generation had 7 children, there would be about 400 descendants. Going back, one further generation, there would be almost 1,100 descendants. Going back 9 generations, there would be almost 17,000 descendants.