On the combined siblingship index the number was 0.2486. The probability of them being half siblings were 19.9% and the likelihood of them not sharing a common biological parent is 4-1. I need help explaining the results.

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    Welcome to G&FH SE! As a new user be sure to take the Tour to learn about our focussed Q&A format which is quite different from bulletin boards, discussion forums and other Q&A sites you may be used to. What company performed the tests that you are asking about?
    – PolyGeo
    Jun 23 at 5:30

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