[harry_ord]

> But it's possible for siblings not to share any genetic material right?

Kinda but the mother always provides the mitochondria.

[CSMastermind]

I think that's an area of open research: https://www.pnas.org/doi/full/10.1073/pnas.1810946115

But yes, that's a good distinction I should have made!

[harry_ord]

Oh that's cool. Now I have something new to read thanks.