02/16/2026
Why Test the Oldest Person?
🧬 They carry more ancestral DNA.
Each generation loses about 50% of the previous generation’s DNA. A grandparent carries DNA that you may not have inherited.
📜 They have firsthand knowledge.
They may remember names, places, family stories, and relationships that aren’t written anywhere.
🔍 Better match quality.
Their DNA will generate stronger and closer matches, making it easier to identify shared ancestors.
How to Build the Tree After Testing
Once the DNA results are in:
Review the DNA matches
Look at close matches first (1st–3rd cousins).
Study shared matches
If Match A and Match B both match your tested relative and match each other, they likely descend from the same ancestral line.
Use shared surnames & locations
Compare:
Surnames
Locations
Migration patterns
Census records
Build the family tree gradually
Start with what you know for sure and work backward using:
Birth & death records
Marriage records
Census data
Obituaries
Cluster matches by family line
Over time, DNA clusters will begin to separate into:
Maternal grandfather’s line
Maternal grandmother’s line
Paternal grandfather’s line
Paternal grandmother’s line
And yes — as you said — the pieces really do start to come together.
Bonus Tip
If possible:
Test both oldest relatives on each side
Upload raw DNA data to other platforms for additional matches
Keep detailed notes so you don’t lose track of connections
Send a message to learn more