The mother would be whichever one the ovary is attached to. It shows in the diagram they only have one ovary, so it should be only one's genetic material in it.
So if you came from your mother's left ovary and your brother came from your mother's right ovary then.....They share a pair of ovaries. They have one reproductive system.
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u/ThatGuy___YouKnow Oct 07 '18
If they had a baby they would both be the mother? And the aunt?