Your first cousin's brother is also your first cousin. Your first cousins daughter is your first cousin once removed.
Your sister's daughter and your son are first cousins to each other.
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.
The relationship to the grandfather or the relationship to the grandson of the grandfather? Let's say your name is Ken, your grandfather's name is William, his brother's name is Eli, and Eli's son is named John. If you're asking about William and John's relationship, they are first cousins. If you're asking about Ken and John's relationship, they are first cousins once-removed.
Your brother's grandchild is your Great Nephew or Great Niece and you are their Great Aunt or Great Uncle.
Your sister's daughter is your niece and you are her aunt (if you are a woman) or her uncle (if you are a man).
rosemary.
She is your cousin
Your daughter's step-sister would be your step-daughter.
Your aunt's daughter is your first cousin.
Grandaughter.
neice
Micheal and Micheal musso? why would they give them the same name? i no that there is mason, Mitchel and Marc musso who are brothers. Dont know if there are others and I don't know their cousins sorry.