Your father's aunt's first cousin could be your first cousin, twice removed. This would be the case if the first cousin is descended from your grandparent's grandparent. In addition to being your father's aunt's first cousin, this person would also be your grandparent's first cousin. Your father's aunt's first cousin could also be unrelated to you. This would be the case if your father's aunt is his aunt because she married the brother of one of his parents. Then her first cousin would not share any of your ancestors and would not be related to you.
Your first cousin.
Your Aunt's first cousin may be your second cousin, onve removed or may be no relation to you at all.
Your great aunt's son is your parent's first cousin and your first your cousin, once removed.
The relation of the mother;s sister to daughter is niece-aunts.
second-cousin
Your are related to some of your first cousin's aunts and not to others. The aunts of your first cousin to whom you may be related are your mother and her sisters or your father's sisters. One of the parents of your first cousin isn't related to you, but married into the family. Anyone of your cousins aunts who are related to that person would not be related to you.
First cousins, twice removed. Aunts daughter is your cousin. Aunts daughters daughter is cousin once removed Aunts daughters daughters daughter is cousin twice removed.
Your aunt's daughter is your first cousin, and her son is your first cousin, once removed.
Your cousin's cousin is no relation to you.
Your mother's aunt's son is her first cousin and your first cousin, once removed.
Your first cousin's aunt may be your mother, or another of your aunts (sister of either your mother or father) or may not be related to you at all. The latter situation occurs if, for example, the cousin is related to you through the brother of your mother, but your cousin's aunt is related through the brother's wife.
Your mother's first cousin is your first cousin, once removed.