In most cases, your great grandmother's husband is you great grandfather. However, if he was her first husband and you are descended from a second or subsequent husband, you are not related to him at all.
If you are descended from a first husband but he is a second husband, then in general, you would not be related, but if he was involved in raising your grandparent, you might refer to him as a step-great grandfather.
If your great great grandmothers were sisters, your common ancestors are your great great great grandparents. That makes you 4th cousins.
You are not related as you do not share a common ancestor.
If your grandmother's sister was a cousin (presumably first cousin) to your husband's grandfather, then your grandmother was also first cousin to your husband's grandfather. You and your husband have a great great grandparent in common and are third cousins to each other.
In most cases, your great grandmother's husband is you great grandfather. However, if he was her first husband and you are descended from a second or subsequent husband, you are not related to him at all. If you are descended from a first husband but he is a second husband, then in general, you would not be related, but if he was involved in raising your grandparent, you might refer to him as a step-great grandfather.
Yes, That was all my great grandmothers had to work with as well as my grandmothers.
1st cousin 2x removed
If your great great grandmother and your husband's grandfather were brother and sister then you and your husband are second cousins, twice removed.
My ancestors
No. The sister is a relation, and her husband is an in-law. The husband's brother is no biological relation either. Therefore, the great granddaughter of the husband's brother is not a relation.
The compound noun great-grandmother is the singular form. The plural form is great-grandmothers.
Yes, it would be correct to say that your family has a history of healthcare professionals. Your grandfather was a Pediatrician, your father is a Cardiologist, and both grandmothers along with one great grandmother were Nurses.
Your great grandmother's brother is your great great uncle. Your parent and the grandson of your great great uncle are Second Cousins. Therefore you and the grandson of your great great uncle are Second Cousins, once removed.