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.
The two great grandmothers are first cousins to each other and therefore share a grandparent. That common ancestor is the great-great-great-grandparent of both Jack and Jill. * First cousins share a grandparent. * Second cousins share a great-grandparent. * Third cousins share a great-great-grandparent. * Fourth cousins share a grea-great-great-grandparent. Jack and Jill are fourth cousins to each other
It would technically be considered your half- cousin since you do have the same grandmother but a different grandfather.
Two people are second cousins to each other if their grandparents are siblings (bothers of sisters). Since your grandmother and his grandmother are second cousins, you and he each have a great great grandparent who were siblings, and that means that you both have a great great great grandparent in common. You can start counting generations from that common ancestor and determine that you and he are fourth cousins. The easy way to figure your relationship to him is to count generations from your grandmothers, whom you know are second cousins. The children of second cousins are third cousins to each other - that is your parent and his parent. The children of third cousins are fourth cousins to each other - that is you and him. You and he are fourth cousins to each other.
If you are referring to YOUR grandmother and grandfather then your children are their great grandchildren. If you are referring to your parents, then your children are their grandchildren. The primary kinship dominates.
Your mothers grandmothers children are each others siblings.
Your son and your nephew are first cousins to each other. Their daughters are second cousins to each other.
If the grandfathers were 1st cousins, the grandchildren of each grandfather are 3rd cousins to each other.
Your granddaughter and your second cousin are second cousins, twice removed, to each other.
Your grandchildren and your grandniece are second cousins to each other..
If two people are first cousins, their children are second cousins. If two people are fifth cousins, their children are sixth cousins.
If two people have grandparents who were siblings, then their parents are first cousins and they are second cousins.People whose grandparents are siblings are second cousins.
Your first cousin's daughter and your son are second cousins to each other. Your second cousin's daughter and your son are third cousins to each other. Your third cousin's daughter and your son are fourth cousins to each other. And so forth.