you are an aunt or uncle of the sun
Your son and your first cousin's child are second cousin's to each other.
Therefore your son and your first cousin's grandchild, of either sex, are second cousins, once removed, to each other.
Your first cousin's granddaughter and your son are second cousins once removed to each other.
Third cousin once removed.
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.
Your son and your first cousin's granddaughter are second cousins, once removed, to each other.
Your granddaughter and your niece's son are second cousins.
Your granddaughter and your sister's grandson are second cousins.
Your granddaughters and son have the relationship of nieces and uncle. Your granddaughters being his nieces and your son being their uncle.
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.
If you are a woman, you are your great grandmother's great granddaughter so your son is the son of her great granddaughter. But there are other possible relationships to other of her great granddaughters.The great granddaughter could be your sister. Then your son is her nephew and she is his aunt.The great granddaughter could be your first cousin. Then she and your son are first cousins, once removed.The great granddaughter could be your second cousin. Then she and your son are second cousins, once removed.
You and your first cousin's son are first cousins, once removed.
Your niece and your son or daughter are first cousins. That would make your niece and your grandchild first cousins once removed. Your niece's child and your grandchild are second cousins.
First cousins once removed. Your child and your nephew are first cousins and there is one generation difference.
they would be first cousins once removed. this is because the grandchild's parent would be your son's first cousin and because its the cousin's child, its once removed
Your granddaughter could be your son's daughter, or your son's niece.