Start with a grandfather who has two daughters Both daughters marry and have sons Will the sons (cousins) show a relation in a DNA test? Thank you

"mike" <micell@ameritech.net> wrote in message news:o1kuf.44810$7h7.22632@newssvr21.news.prodigy.com... > Start with a grandfather who has two daughters > Both daughters marry and have sons > Will the sons (cousins) show a relation in a DNA test? > Thank you If the daughters had the same mother, and you check the mitochondrial DNA, yes. They will not show a match to each other in terms of y chromosomes unless their fathers were related in the male line. They will not show a match to the grandfather as he had a different mother. To summarize: mitochondrial DNA gives you the single, all female line - mother's mother's mother, etc. y chromosomes give you the single male line - father's father's father, etc. Break the link to gender - father's mother's father for example, and you won't find anything. Neither method will tell you where the common link was - it could be at the sibling level or at the 10x grandparent level - just that there is an unbroken line of the relevant gender. To show where the link was, you would need to use other genealogical tools. For example, prove that Kermit MacMuppet was the only person called MacMuppet in the area and it's reasonably certain that he founded the 5 different families from that area. If, however, his distant cousins Ralph and Munsta MacMuppet were also in the area at the time, the yDNA will not tell you which of the 3 is the patriarch of which family. Lesley Robertson Lesley Robertson