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.
Your grandmother's sister is your great aunt. Her daughter's daughter (her granddaughter) is your second cousin.
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!
They are sisters; both daughters of Rhea and Cronus.
They would be great nieces or great nephews.
your second nephew
Medusa and her two sisters were daughters of Phorcys and Ceto.
4 daughters, 3 sons.
Your sister's son is her grandson and your great nephew. Some use the term "grand nephew."
That would be your cousin so no you can't.
I believe that would be a fifth cousin
Daughters of one (or both) the same parents are either sisters or half sisters.