>Who would I need to test to determine my paternal
>grandfather mother line? No known descendants are
>available (my grandfather siblings which shared the
>same mother are deceased)

Are there any cousins living who descend from your paternal grandfather's mother's mother? (Did your grandmother's mother have sisters?) If so, tell me how the cousins descend, and I will then be able to tell you whether they can be test subjects for this line. The test person can be male or female, but for every generation before the person being tested, there must be female-to-female descent back to your great-grandmother's mother.

>Also which test to trace my paternal grandmother
>mother parents lines which almost no known data is >known.

Are there any cousins living who descend from your paternal grandmother's mother's mother? (Did your grandmother's mother have sisters?) If so, tell me how the cousins descend, and I will then be able to tell you whether they can be test subjects for this line. The test person can be male or female, but for every generation before the person being tested, there must be female-to-female descent back to your great-grandmother's mother.

>Paternal grandmother father line, but my paternal >grandmother brothers are deceased with no known >sons.

Again, you need to look to cousins, but if there are no living male-to-male descendants of your paternal grandmother's father's line, there is no way to test for that line.

>Who to test for my mother father mother line if my
>grandfather had no siblings?Could I use in this case
>my grandfather mother sister or the sister chidren?

Yes, assuming she had the same mother as your grandfather's mother, you can use your grandfather's aunt or her children to get your grandfather's mother's lineage.