Half Siblings & Shared DNA
I have a situation in my family where 2 individuals (who were thought to be full siblings) appear to be half siblings based on their DNA tests in Ancestry (who lists them as "first cousins"). I am wondering if there is a possibility that the two fathers of the half siblings could have been first cousins themselves. The two half siblings share 30% DNA, and 2070 cM across 62 segments according to Ancestry. If the fathers had been fiirst cousins, would the amouns of shared DNA be a bit higher than those I've listed above? Is their any chance that the two half siblings could actually be first cousins? Thanks in advance.