He/She would be considered your second cousin.
There is no relationship. You do not share a common ancestor. Your mother's cousin would be your first cousin once removed.
You mother's first cousin is your first cousin, once removed.
The first cousin of your mother's first cousin may be your second cousin, or may not be related to you at all. It depends on how he cousin relationship in your mother's generation is structured.
your great cousin twice removed.........i think
If Paul is your first cousin, then he is your mother's nephew, and she is Paul's aunt.If Paul is your second cousin, then he is your mother's first cousin, once removed, (if he and your mother are descended from one of her grandparents) or he is not related to your mother (if he is your cousin because of a relationship on your father's side of the family.)If Paul is your first cousin, once removed, then he is your mother's first cousin or he is related to your father and not to your mother.Other relationships apply depending on what other kind of cousin Paul is to you, always with the possibility that Paul is not related to your mother at all - because your relationship to him comes through your father.
You and your mother's first cousin are first cousins, once removed, to each other.
Your mother's first cousin's son is your second cousin. Her first cousin's son's son (her first cousin's grandson) is your second cousin, once removed.
Your mother's first cousin is your first cousin once removed. Your mother's second cousin is your second cousin once removed. If you are talking about your mother's first cousin once removed, you may be first cousins twice removed or second cousins, depending on the specifics.
The daughter of your mother's sister is your first cousin.
You are second cousins
second cousin
Your mother's sister is your aunt and her daughter is your first cousin.