Wondering if anyone has done dna comparisons between double-cousin relatives. For instance, supposing I have a third cousin whose parents are first cousins? How much more gene sharing is there between me and my third cousin than there would be otherwise? Can I just double the amount of expected gene-sharing since he is my third cousin in two ways? This is not just an academic question since the situation can and does come up with certain frequency in my research. I've posted this to the DNA board as well. Thanks in advance....
