[forensic-science] daughters of different mother? DNA and what can it tell?


Woman alleged to be the mother of two woman. However, siblings remember
the possibility that the mother of one of the girls, was actually the
sister of the alleged mother. That the "mother" took her sisters
daughter and raised her as her own.
Since mt-DNA follows the maternal line, how is one to be able to
determine using DNA if the two woman are sisters?
If the father is different (as I suspect would be the case) what other
definitive evidence could be gather using DNA to determine if the woman
are of the same mother?
There is the possibility of gathering DNA from both "daughters" and a
brother. Father is deceased.

Thank you for your feedback. This has bothered me for far too many
years and I need to find out what DNA tests could determine the truth.

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