Collateral Line Research for Proving Direct Descent

Collateral line research is the strategy of studying the siblings, cousins, and other relatives of a direct ancestor in order to gather evidence that sheds light on that ancestor when their own records are missing or ambiguous. Because relatives often appear in the same records, their documents can reveal birth places, parents, and family connections that do not survive for the target individual.

AI tools help researchers identify and prioritize collateral relatives quickly by scanning family trees for gaps, suggesting which relatives are most likely to have surviving records, and summarizing what those records might reveal about the original ancestor being researched.