What is a collateral ancestor? In genealogy, collateral relatives are the siblings, cousins, aunts, uncles, and other family members who branch off from your direct line. They may not be your direct ancestors, but they often hold the clues, stories, and records that can help fill in the gaps of your family history.
During the COVID years, I was contacted by a cousin who found me through my blog. She was researching her Logan family and reached out, hoping I might be able to help. At first, I wasn’t sure how much information I could offer. Most of what I knew came from my own research, but we soon discovered we shared an interest in the Logans of Restalrig and had a DNA connection. I shared what I knew about the family, the Logan clans, and a few resources that might help her continue her search.
Several months later, she mentioned that she had old family photographs of some of her Logan relatives. My first thought was that they probably wouldn’t have much relevance to my own line. Fortunately, I was wrong.
I’ve often encouraged researchers to “go sideways” and learn about collateral relatives, not just direct ancestors. This was a perfect example of why. Among her collection was a photograph of my third-great-grandfather, Lemuel Logan (1797–1869). Until that moment, I had never seen a picture of him.
These photographs were found in an old album that belonged to her great-grandfather, who was my second cousin, twice removed. What makes the story even more interesting is that she descends from Lemuel’s first wife, while I descend from his second wife. Without the records, photographs, and stories preserved by another branch of the family, I might never have seen an image of my third-great-grandfather.
This experience is a great reminder of why collateral research matters. Family history is not just about tracing a single line backward. It is about understanding the entire family and the connections between its branches. The relatives who seem unrelated to your immediate research question may be the very people who hold the missing photograph, family Bible, letter, or story you’ve been searching for.
When we research siblings, cousins, aunts, uncles, and their descendants, we often uncover information that would never appear in our direct ancestral line. In my case, a cousin’s old photograph album provided a priceless glimpse of an ancestor I thought I would never see.
So the next time your research seems to hit a brick wall, consider looking sideways. Your collateral relatives may be holding the piece of the puzzle you’ve been missing all along.




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