The grandson of your first cousin and your grandson are third cousins to eachother.
Your niece and one of your grandson's parents are first cousins. That makes your niece a first cousin once removed of your grandson.
Yes, they are related. While it is a distant relationship, you are cousins.
Your first cousin's daughter is first cousin once removed to your grandson, and he to her. Your second cousin's daughter is second cousin once removed to your grandson, and he to her.
No. Prince Philip, Duke of Edinburgh, is a great-great grandson of Queen Victoria. He and Queen Elizabeth II are third cousins through descent from Queen Victoria, and second cousins once removed through descent from King Christian IX of Denmark.
No. Step cousins are not related to anyone in your family, other than perhaps your step-siblings or step-parent.
You and your great uncle's grandson are second cousins.
Your grandson and your nephew are first cousins, once removed.
You and your great great aunt's great grandson are third cousins.
Your grandson and great grand son could be cousins,(first cousins once removed), they could be uncle and nephew, or they could be father and son. It depends on how they are related to your children. If your great grandson is the grandchild on one of your children and your grandson is the child of a different one of your children, they are first cousins, once removed. If your great grandson is the child of a sibling of your grandson, then they are uncle and nephew. But your great grandson could also be the son of your grandson. Then they are father and son
You and your great aunt's grandson are second cousins. Your great aunt was the sibling of one of your grand parents, so your parent and your great aunt's child were first cousins. You and the grandson are members of the next generation and therefore second cousins.
First cousins twice removed.
They would be the fourth cousins. They share a common 5 Great Grandparent.
Your grandson and your great great niece are second cousins, once removed, to each other
Your daughter and your uncle's great great grandson are second cousins, three times removed.
Your granddaughter and your first cousin's grandson are third cousins to each other. You find their common ancestor that is, your grand parents, and count the number of generations separating them, there are Brother and Sister then cousins, you and your cousin would be one (first cousins), your children and your cousins children are second cousins and their children are third cousins and so on.
Your grandson and your brother's grandson are second cousins to each other.
Your niece and one of your grandson's parents are first cousins. That makes your niece a first cousin once removed of your grandson.