Your husband's first cousin's child and your daughter are second cousins to each other.
Your husband's first cousin's granddaughter and your daughter are second cousins, once removed, to each other.
Your husband's first cousin's granddaughter and yourgrandchild are third cousins to each other.
Your 1st cousin's granddaughter would be your daughter's niece.
Your sister's daughter and your daughter are first cousins to each other. Your sister's daughter's daughter (her granddaughter) is first cousin once removed to you daughter. Your granddaughter and your sister's granddaughter are second cousins to each other.
Your child and your sister's daughter are first cousins. Your grand child and your sister's daughter are first cousins, once removed.
Your daughter and your first cousin's daughter are second cousins to each other. Your daughter and your first cousin's granddaughter are second cousins, once removed, to each other. Your granddaughter and your first cousin's granddaughter are third cousins to each other.
Your brother's daughter and your daughter are first cousins to each other. Your brother's daughter and your daughter's daughter (your granddaughter) are first cousins, once removed, to each other.
Your daughter's daughter is your grand daughter. Your nephew's daughter is the granddaughter of your sibling (your brother or sister) The grandchildren of siblings are second 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.
Your granddaughter and your second cousin are second cousins, twice removed, to each other.
Your granddaughter and your niece's son are second cousins.
You would be 2nd cousins, assuming that the brother's wife's granddaughter is also the brother's granddaughter. If the granddaughter is not the granddaughter of the brother, there is no relationship.
they're your cousins
Your granddaughter and your sister's grandson are second cousins.