If you have short ancestors and tall ancestors the genes can express themselves in various combinations... Sounds like your sis got tall genes and you got short genes. I had two very tall grandfathers and two short grandmothers.. My dad got his mum's shortness, and my mum her dad's tallness.. I ended up with the tall and my older brother with small.
IIN my sister part 2
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If you have short ancestors and tall ancestors the genes can express themselves in various combinations... Sounds like your sis got tall genes and you got short genes. I had two very tall grandfathers and two short grandmothers.. My dad got his mum's shortness, and my mum her dad's tallness.. I ended up with the tall and my older brother with small.