Your first cousin's sister is also your first cousin. Your second cousin's sister is also your second cousin. And so forth.
The child (son or daughter) of your first cousin is your first cousin, once removed. The child (son or daughter) of your second cousin is your second cousin, once removed. And so forth.
You are each others cousins.
Your son and your sisters child are first cousins. The granddaughter is out of synch by a generation. That will make them first cousins once removed.
Children of sisters are first cousins. Grandchildren of sisters are second cousins. Great grandshildren of sisters are third cousins.
Our cousins are our mothers sisters son :)
Your daughter and your sister's son are first cousins to each other.
Your grandfathers' sisters' grandchildren are your second cousins.
Their brothers, sisters, parents, cousins.....
Your son and your niece are first cousins. Her daughter and your son are first cousins, once removed.
Well, it depends how close you are to your husbands family. If you really want to know they are cousins-in-law.
Your sister's son is your nephew. Your son's daughter is your granddaughter. Your son and your sister's son are first cousins to each other. Your son's daughter and your sister's son are first cousins once removed to each other. Your grandchild and your sister's grandshild are second cousins to each other.
Your son and your nephew are first cousins to each other. Your son's daughter and your nephew are first cousins once removed.
Yes, of course your son and your great niece are related. They are first cousins, once removed, to each other. (Your great niece's parent, your niece or nephew, and your son are first cousins to each other.)