Your great uncle is the brother of one of your grandparents. His daughter is your first cousin, once removed. Her husband is not related to you, but her children are your second cousins.
Your great uncle.
Your great aunt's husband is your great uncle, but his siblings and their children and grand children are not related to you. The grandsons of your great aunt's husband's siblings are his great nephews (not related to you). On the other hand, all of your great aunt's great nephews are also her husband's great nephews. These great nephews are the grandchildren of your great aunt's siblings. They are you (if you are a boy), your brothers (if you have any), your male first cousins and your male second cousins on whatever side of your family your great aunt is on.
Your great niece or great nephew, and you his or her great aunt.
If the dad's sister's aunt is also your dad's aunt, then your dad's aunt is your great aunt. However if she is not your dad's aunt, then she is your aunt's aunt and not necessarily related to you.
Aunt
You granddaughter is a great great niece of your aunt. Your aunt is your granddaughter's great great aunt.
Your husband and your aunt are not related to each other.
You are your aunt's nephew and therefore also her husband's nephew. Her husband is your uncle.
Your granddaughter's husband might be called your grandson-in-law, although the term is rarely used. Hissister is your granddaughter's sister-in-law, but is not related to you.
my cousin's husband
If your a boy they would call you great uncle, if your a girl they would call you a great aunt.
Aunt Josephine's husband is Isaac Anwhistle.
Your great aunt is your daughter's great great aunt. Your daughter is your great aunt's great great niece.