How are your parents brother and sister related to you
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Here is your answer
Let's talk about brothers and sisters first.
The possibility of genetic sameness ranges from 0 to 100 per cent between brothers and sisters.
Your mother and father each has 23 pairs of chromosomes. Each pair splits into two strings. It's possible that you, if you are a man, and one of your sister got different strings from every pair of chromosomes of your parents. In this case, you and this sister have completely different genes, even though your parents are the same two people.
You and your siblings of the same sex have at least the same sex chromosome string from your father. And it's possible that you and one of your siblings of the same sex got the same strings from every pair of chromosomes. In this case, you and this sibling of you have completely same genes, even though you two are not twins.
I should emphasize that any percentage of shared genes between you and your siblings is equally possible. The predominant way to think you and your siblings share 50% of genes is only an averaged number. To make 50 by averaging two numbers, 0 and 100 work equally well as 40 and 60, or 30 and 70.
Now, let's see what percentage of genes you and your parents' siblings may share.
The possibility ranges from 0 to 50 per cent at most.
If you are a man, you at least share the same string of sex chromosome with the males with the same last name on your father's side. If your are a woman, any percentage of shared genes from 0 to 50 per cent is equally possible between you and your parents' siblings. I think this explains why some times a person may look very similar to one of his parents' brother or sisters, if the percentage of shared genes of the person and the one of his/her parents' siblings reaches 50 or a near number.
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