It is exciting when you find a new DNA cousin who actually has a family tree. However it can take days to wade through it looking for the common ancestor and more often than not, you do not find it. Sometimes that is because the ancestor is too far back in time. Other times it is on a line that is not documented or is just wrong. Also there can be spelling discrepancies or if you have Norwegians, naming differences (father’s name or farm name used for surname).
You would think that there would be good automated tools to do this and you would be right. These are the ones I know of.
- GCU from DNAgedcom
- GEDmatches at WIKItree
- Using the how related function at various one world trees
Partial results of a GEDmatch compare one GEDcom to all run