Any match your brother has on the X with another male will be reported as a full (100%) match, since there is just one X chromosome to consider. Ann Turner On Wed, Nov 16, 2011 at 8:42 PM, Fran Meng <[email protected]> wrote: > My brother shares on the X base pairs with a full match with several > people including our second cousin. Our maternal grandmothers were > sisters. Should I conclude that 1/2 is from our mothers and the other 1/2 > is from our fathers?Could our fathers also be related? > Fran > [email protected] >