Translation of "прабабушка" in English

Моя прабабушка была портнихой.

My great-grandmother was a dressmaker.

Прабабушка - бесспорный матриарх нашей семьи.

Great-Grandma is the undisputed matriarch of our family.

Прабабушка Пола написала много книг.

Paul's great-grandma has written many books.

Моя прабабушка таких слов, как «феминистка», даже не знала.

My great grandmother did not know that word "feminist,"

Мать бабушки - это "прабабушка", а мать прабабушки - это "прапрабабушка", верно?

My grandmother's mother is my "great grandmother," so my great grandmother's mother is my "great great grandmother"? Is that right?

Мать моей бабушки - моя прабабушка, таким образом, мать моей прабабушки - моя прапрабабушка? Верно?

My grandmother's mother is my "great grandmother," so my great grandmother's mother is my "great great grandmother"? Is that right?