While some people prefer the terms grand aunt or grand uncle, parallel to grandmother or grandfather, the terms great aunt and great uncle are widely used and accepted, and are functionally the same.
Your great aunt is the sister of one of your grandparents, which makes you a grand niece or grand nephew (great niece or great nephew). The son of said grand aunt is a first cousin of one of your parents. The son's daughter is first cousin once removed to your parent, and second cousin to you.
Great Niece.
She would be your great grandmother
Your aunt's daughter is your first cousin, and her son is your first cousin, once removed.
Dina Bonnevie has two sons and one daughter. Her sons are with her former husband, actor and director, and her daughter is from a later relationship. She has often spoken about her close relationship with her children.
your cousin
The relationship to you would be your cousin !
Cousine
It's called the daughter-in-law.
i am my own grandfather
They are second cousins
aunts, cousins, daughters, sons, and friend.
Your son and your nephew are first cousins to each other. Their daughters are second cousins to each other.