Mossie's Musings

The matches that you share with your AncestryDNA "cousin" can help you work out the common ancestors between you and the "cousin".   BUT it's important to understand that all AncestryDNA is reporting is that the shared march is appealing on both your match list and the AncestryDNA "cousin's" match list.   You can ONLY see which matches you share with 4th cousins and closer.  So you must share 20cM or more with your AncestryDNA "cousin" and the shared match and the AncestryDNA "cousin" must share 20cM or more with the shared match.   Here's an  example from my only match list.  I share 31cM of DNA with Bill.  He's my 3C1R on my maternal M7 Clancy and M8 Flaven lines.  All our shared matches are on that line except Robyn.  I share 43cM of DNA with Robyn.  She's my 4C on paternal P5 Gersbach line.   When I look at my shared matches with Robyn, apart from Bill, they  are on my paternal P5 Gersbach line. Here's my

Working with chromosome data Why is it important to analyse chromosome data?  What is triangulation?   Gail Bryant, Vicki Hails, Barbara McAlary and Christine Woodlands will lead the discussion.  Here are some references including links to DNA Sydney Blog and Facebook group. Rootstech 2021: Roberta Estes - DNA Triangulation: What, Why and How DNAeXplained: A Triangulation Checklist DNAeXpalined: 23andMe Changes: Triangulation Doesn't Work the Same Way genemonkey25: DNA Research Methodology Jared Smith: Genetic Genealogy using GEDmatch Genie1: How to Download your Raw DNA Data DNA Sydney Blog: Autosomal Analysis DNA Sydney Facebook group MyHeritage: How can I find triangulated DNA segments? My thoughts on DNA testing and transfer strategy for Australians... Veronica's excellent blog post - "Reuniting the Britton family" - an Irish story with plenty of chromosome triangulation!