First cousins twice removed.
My ancestors
1st cousin 2x removed
you will be his great great grand son/daughter..:)
Great Niece.
That would be her great uncle I suppose. Common sense.
Your brother would be your son's daughter's great uncle and your son's daughter would be your brothers great niece! Hopefully that makes sense :)
Your sister's daughter is your niece and you are her aunt (if you are a woman) or her uncle (if you are a man).
You are third cousins.
Both grandmothers are living. Their great grandmother died of cancer.
If you and someone else have grandmothers who were First Cousins, the parents of those grandmothers were siblings and you and someone else have great-great-grandparents in common. Therefore you and someone else are Third Cousins.
That was Fred. Great guy.
Your brothers great granddaughter is your great great niece.