You can get some odd fractions by two parents having similar lineages. Like, if your mother is Irish, and your great-grandmother on your father’s side is Irish, you would be five-eighths Irish. I’m having trouble finding a combination that gives you thirds, though.
Sprinkle in a little incest and we are good to go.
I also have no idea, I thought it was all halves of halves.
You can get some odd fractions by two parents having similar lineages. Like, if your mother is Irish, and your great-grandmother on your father’s side is Irish, you would be five-eighths Irish. I’m having trouble finding a combination that gives you thirds, though.
Doesn’t exist, 3 is prime. No combination of 2^-n will get you a 3 in the denominator.
…unless somewhere along the tree there’s a person who shows up twice.