>The lineage is my father's father's father's,father's,father's mother.
>I guess that is actually my gggg-grandmother. My father has one living
>sister and she has a daugther. Would that help me?

No, she would have her mother's mtDNA which would be your father's mother's mtDNA. You need the female descendant of one of gggg-gramdma's female children. Since this is a male to male line from your ggg-grandfather to your father, you have to find a distant, distant cousin, someone descended female-to female from a sister of your ggg-grandfather.

tootncmon