That would be second cousin once removed. Your parent and your grandmother's sisters daughter were first cousins. You and the daughter's daughter are second cousins. There is a difference on one generation between the two of you.
If you have no siblings but your daughter has an uncle, he is the brother of your spouse, your brother-in-law.
go ahead if you want to marry your aunt
Your sisters daygter is your neice!
your second nephew
They would be great nieces or great nephews.
They are sisters; both daughters of Rhea and Cronus.
4 daughters, 3 sons.
Medusa and her two sisters were daughters of Phorcys and Ceto.
She is your niece, you are her aunt or uncle.
Your sister's son is her grandson and your great nephew. Some use the term "grand nephew."
I believe that would be a fifth cousin
That would be your cousin so no you can't.