Please help settle a dispute. 1. A man born in 1658 has 35 repeats at cdy-b. His great-great-grandson born in 1822 has mutated up to 37 repeats at cdy-b. The second man's great-great-grandson born in 1965 has back-mutated to 36 repeats at cdy-b, while two other descendants (one through a different son of the man born in 1822, one through the same) still have 37. 2. The same man born in 1658 still has 35 repeats at cdy-b, but this time his great-great-grandson born in 1822 has only 36 repeats at cdy-b. Two of his descendants through different sons both mutate independently to 37, while a third remains at 36. Thanks for your help.