Technically you are not related to your uncle's wife's sister, but some families think of such a person as another aunt, and the sister may think of you as her nephew.
Probably your niece-in-law.
Your great uncle
The wife of your first cousin is not related to you.
Your daughter is your uncle's grand niece.
Your Uncle's son is your first cousin.
Your grandfather's brother is your great uncle and your parent's uncle.
You grandson is great great nephew to your uncle. You uncle is great great uncle to your grandson
You grandson is great great nephew to your uncle. You uncle is great great uncle to your grandson
uncle
Yes, he is their great uncle.
He would be his great great great uncle
You and your uncle's grandson are first cousins once removed.