Inspired by this post from the Legal Genealogist – Happy mtDNA Day 2020!. I talk mitochondrial DNA (mtDNA) on occasion. It’s a type of DNA that inherited from your mother. It’s only passed down through daughters. In my case, my two brothers, sister, one half-sister, and me all have our mother’s mtDNA. My half-sister died the day she was born and obviously didn’t have any children. My oldest brother and I have one or more children. My middle brother has no known children, but he did sow a lot of oats in his youth. I won’t be surprised if I find one or more nieces or nephews from that oat sowing. My sister has two daughters and four grandchildren – three girls and a boy. All of us siblings share the same mtDNA from my mother. My sister’s daughters and grandchildren also share the same mtDNA. The three granddaughters will pass it on their children if they have children. The grandson won’t pass it on; same for me and my brothers. One of my sister’s daughters has tested with 23andMe and has the same basic mtDNA as me.
Of my siblings and my sister’s daughters and grandchildren, I am the only one who has DNA tested with a full mtDNA test at FamilyTree DNA (FTDNA). My mother had a full sister and full brother as well as a half-sister who also share the same mtDNA. Her brother wouldn’t pass on the mtDNA to his children. The sister and half-sister had children although my half-aunt Helen’s son died about 11 years ago. Several of Aunt Eleanor’s children have DNA tested with 23andMe which gives a basic mtDNA haplogroup which matches with my basic mtDNA haplogroup at 23andMe.
I am hopeful that one day I can get more of my siblings and my sister’s daughters and grandchildren to do an mtDNA to test a theory.
My maternal grandmother has several siblings; her sisters passed on their mother’s mtDNA; the brothers did not.