The World’s Largest Shared Family Tree

The World’s Largest Online Family Tree (familysearch.org) 

What’s a “Shared Family Tree”?

FamilySearch’s unified family tree differs from the tree-building experience at most other websites. Instead of concentrating efforts on privately constructing their own individual trees, FamilySearch tree builders cooperate to build a single, shared tree that helps you and others discover more about ancestors and other family members.