Learn English – Is the “female” in “female cousin” redundant here

a) It's correct to use the term "actor" for males and females

b) It's an international phenomenon

c) For origins and purpose of the change, see the Wikipedia entry for actor:

The word actor refers to a person who acts regardless of gender, while actress refers specifically to a female person who acts; therefore a female can be referred to by either term. The Oxford English Dictionary states that originally "actor" was used for both sexes. The English word actress does not derive from the Latin actrix, probably not even by way of French actrice; according to the Oxford English Dictionary, actress was "probably formed independently" in English. As actress is a specifically feminine word, some groups assert that the word is sexist. Gender-neutral usage of actor has re-emerged in modern English, especially when referring to male and female performers collectively, but actress remains the common term used in major acting awards given to female recipients and is common in general usage.

There isn't any family relationship between you and Mark, except

• the cousin of your cousin is yourself or your sibling
• the cousin of your cousin is also your cousin if his mother is the sister of your father
• the cousin of your cousin is your second cousin if his parents and your parents are cousins (third cousin if the parents are second cousins, and so on)

A term what many people use is grand-cousin. But that's wrong, though it is used ambiguous in colloquial, at least in my mother-tongue. But think of that:

• Your grandparents are the parents of your parent
• Your grandaunt/granduncle is the the aunt/uncle of your parent

This leads to

• Your grand-cousin is the cousin of your parent.

If no blood relation exists there are only few ways how a non-related person can be your cousin: E.g. the person is your step-cousin. But this doesn't work here, because:

Step-cousins are either stepchildren of an individual's aunt or uncle, children of one's step-aunt or uncle, or half-siblings of one's cousin. ^(WIKIPEDIA)

On the WP page you find a lot of family combinations and what they are called (e.g. Cousin-in-law: spouse of an individual's cousin), but I didn't find the relationship you mention. (Correct me, if I overlooked it)

Conclusion: I would call him cousin of cousin.