We are all related. If you can connect to the One World Tree in WikiTree then WikiTree's relationship finder shows you how. Not all of us can make that connection.
Another way to see your relationship is if you (or your father/brother) have taken a Y-DNA test and joined Family Tree DNA's WikiTree DNA Project. The following uses WikiTree member Rob Spencer's clustering tool which is available at mitoYDNA.org.
It shows the relationship of the earliest known direct paternal line ancestors (who should be in WikiTree) of Y-DNA37 tested males in FTDNA's WikiTree DNA Project.
Click once (and then again) on the graphic to enlarge. tMRCA above means time to the Most Recent direct paternal line Common Ancestor.
If you or your relative has taken a Y-DNA37 (or higher) test and their earliest known direct paternal line ancestor is in WikiTree then join them to the FTDNA's WikiTree DNA Project. Then I can create a revised chart in a week or so.
Here is the relationship of the earliest known direct maternal line ancestors in WikiTree of mtDNA testees who are in FTDNA's WikiTree DNA Project.
I would like to figure out how to easily do this for all Y-DNA and mtDNA testees who have their mitoYDNA ID in WikiTree. Ideas?