Incognito: I totally agree with your above post, but I don't know what you mean by matrilineal line? Do you mean your mother's line? There is mitochondrial DNA you get from your mother, which your brother will not match, only a sister or other female relative who is descended from your mother or her mother. Then there is the DNA you get from both parents, which would match your siblings. There is also the Y sex chromosome which men get from their father. So, did the LW have a living sister or mother or grandmother or aunt?

It is expensive to have DNA testing done.