Neither set are identical, in fact my mum and her sister and my dad and his brother could not be any more different.

My brother has a child and it was a singleton, what are his chances of producing twins?

Your chances are higher than your brother’s because to produce fraternal twins you need two eggs. There’s no way for a man to have any effect on how his partner ovulates so the fact that your parents are twins mean nothing as far as he is concerned. Since you’re a woman, your ovulation patterns would be more likely to produce twins because you could have inherited the gene from either your mother or your father.

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