Toot hello.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)Also which test to trace my paternal grandmother mother parents lines which almost no known data is known.Paternal grandmother father line,but my paternal grandmother brothers are deceased with no known male sons.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?

Robert