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Since the father and mother each contribute half (23 chromosomes) of the genetic material needed to form a child (46 chromosomes), the brother and sister are equal in terms of biological similarity, no matter if they had a different mother (same father) or father (same mother). However, if any of the father/mother pairs are related, the result is skewed.

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Q: Who would you consider more of a biological brother and sister children that are born from the same mother different father or children from the same father different mother?
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