This is the 6074th most frequent German word.
cousin
A cousin is the child of one's aunt or uncle.
Here, 'Cousin' refers to a male cousin as it is used with the masculine article 'mein'.
Mein Cousin besucht uns nächste Woche.
My cousin is visiting us next week.
In this instance, 'Cousine' is the feminine form, used for a female cousin, indicated by 'Meine' (feminine possessive article).
Meine Cousine ist sehr talentiert.
My cousin (female) is very talented.
The plural forms 'Cousins' (male cousins or mixed gender) and 'Cousinen' (female cousins) are employed here to indicate multiple cousins.