Your mother's first cousin's daughter is your second cousin.
Your niece and your daughter are first cousins. Your niece's daughter and your daughter are first cousins, once removed.
Your daughter and your first cousin are first cousins, once removed.
Your niece and your daughter are first cousins. Your daughter and the daughter of your niece are first Cousins, once removed.
Your daughter and your nephew are first cousins to each other. Your daughter and your nephew's son are first cousins, once removed, to each other.
Your daughter and your niece are first cousins. Your daughter than your niece's son are first cousin's once removed. Your daughter's child and your niece's child are second cousins to each other.
The children of siblings are first cousins, so your daughter and your brother's daughter are first cousins to each other.
Your daughter and your first cousin's son 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 sister's child are first cousins. Your daughter and your sister's grandchild are first cousins, once removed.
Your first cousin's daughter is your first cousin, once removed. Your child and your first cousin's daughter are second cousins to each other.
Your son and your niece are first cousins. Her daughter and your son are first cousins, once removed.
Your daughter and your niece are first cousins Your daughter and your great grand niece are first cousins, twice removed.