Is it legal to marry your father's cousin?

Answer 1

Your father's fist cousin is your first cousin, once removed.

In most palces simple first cousin marriages are legal, so marriages betwen first cousins once removed would also be legal. But the ultimate answer depends on the laws of the place where you are.

Answer 2

Your mother's first cousin's daughter is your second cousin.

Although some people think that is too close a relationship for marriage, in the US and most other "western countries" there is no legal prohibition against the marriage of second cousins.

Answer 3

In most common law jusridictions the answer is no; but in Canada (a common law country) you can marry your uncle You can also marry your niece, your nephew, your aunt and your uncle.