The aunt of your first cousin's child is your first cousin's sister, who is also your first cousin.
Your aunt's child, son or daughter, is your First Cousin. The same is true for your uncle's children.
Your child and your niece are first cousins to each other. Your child and your niece's child are first cousins, once removed.
Your child and your first cousin's child are second cousins. A full generation is another set of cousins. For example, the second cousins' children will be third cousins, etc. Now here is the tricky part. You are a first cousin once removed to your cousin's child and your cousin is a first cousin once removed from your child.
Your sister-in-law is either the sister of your spouse or the wife of your brother. In either case, her children are your nieces and nephews and you are their aunt (if you are female) or their uncle (if you are male).
No, she is your first cousin once removed. Your first cousins are the children of your aunt/uncle.
The mother and the aunt's child are first cousins to each other. The mother and the first cousin's child are first cousins, once removed.
Your son and your aunt's child are first cousins, so your son and your aunts grandson (the son of your aunt's child) are first cousins, once removed.
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.
Your aunt's child, son or daughter, is your First Cousin. The same is true for your uncle's children.
Your aunt's children are your first cousins and theirchildren are your first cousins, once removed.Your children and the children of your first cousins are second cousins to each other.
For clarity. let's call your grandmother's aunt "the aunt". Sequence of relationship: (1) The aunt's child and your grandmother are 1st cousins (2) The aunt's grandchild and one of your parents are 2nd cousins (3) The aunt's great grandchild and you are 3rd cousins
The child of your grand niece (also called great niece) is your great grand niece or nephew (or great great niece or nephew). If you are a woman, you are that child's great great aunt; if you are a man you are the child's great great uncle.
Your father's brother's wife is your aunt, but her cousins and their children are not related to you.
Your mother's sister is your aunt. Your aunt's child is your first cousins. Your aunt's grandchild is your first cousin, once removed. Your aunt's great grandchild is your first cousin, twice removed.
The child of your niece is your great nephew (if the child is a boy) or your great niece( if the child is a girl). You are the child's great aunt, because you are a woman. A man would be the child's great uncle.
Your child and your nephew are first cousins, so your grandchild and your nephew are first cousins once removed.
Yes, the children of your cousins are also your cousins, but a different kind of cousin. The child of your first cousin is your first cousin, once removed. The child of your second cousin is your second cousin, once removed. The child of your first cousin, once removed, is your first cousin, twice removed. On the other hand, your child and the child of your first cousin are second cousins to each other. Your grandchild and the grandchild of your first cousin are third cousins to each other.