The grandchildren of your grandmother and the grandchildren of any of her siblings (including of her brother) are second cousins to each other.
Your brother's daughter is your niece and his granddaughter is your great niece.
You and your father's cousin's granddaughter are 2nd cousins once removed.
nothing
a relationship between brothers should be sacred and good....
Hopefully, women who are grandmothers of the same children are friends, but in western culture they are not otherwise related. They are the mothers of the parents of the children
Your daughter's daughter is your granddaughter, and you would be her grandmother or grandfather.
There is no word in the English language for a relationship between grandmothers of related grandchildren
Your grandfather's great great granddaughter could be:your granddaughteryour great niecefirst cousin, twice removed
They were brothers.
between your grandaughter husband, and you? if you have a granddaughter husband, you may not want to make that public. i don't know if that's legal.
brothers
They are brothers.