> [...] > If the uncle isn't related to me except by marriage, how could I be > second cousins once removed with his great-great granddaughter? > [...] > > [email protected] What you aren't making clear is whether or not the gggdaughter of the "uncle by marriage" is also the gggdaughter of your "aunt". Some examples of nomenclature I use: An aunt of mine married, and she and her husband had children. They are my cousins. Another aunt married a man who already had children. They are my step-cousins. If an aunt had brought up her husband's nephews and nieces, I would consider them my foster cousins. (How I treat all three groups would probably depend on relative ages and how often we met.) In all cases, I would call the uncles "Uncle", but know that they were uncles-in-law. [email protected] (cecilia)