Your grandfather's great nephew is your second cousin.
Your grandfather's nephew would be your First Cousin once removed Ref: http://freepages.genealogy.rootsweb.ancestry.com/~gentutor/chart.html
yes
Yes, your grandfather's granddaughter could be your sister, making her son your nephew.
Your great grandfather's sister is your great great aunt. You are her great great niece or great great nephew, depending on your sex.
What is your great-great-great grand nephew?!
She will be your aunty
Your nephew as well...
You're a Great Aunt to your nephew's son, who is your great nephew.
Your wife's nephew is your nephew, but the English language has no relationship term for your nephew's wife. Just call her "my nephew's wife."
Your grandfather's nephew's daughter is your second cousin because you both have a common ancestor in at least one of your grandfather's parents.
No, there is no such legal or traditional relationship as nephew-in-law. The term nephew-in-law is not recognized, as it can create confusion due to the lack of clarity in describing the actual relationship.
Neice or nephew no dummy its nephew