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cousin
Note: Japanese いとこ itself is gender-neutral; the male/female distinction is from English glossing only.
いとこと久しぶりに会って嬉しかった。
I was happy to see my cousin after a long time.
いとこは同い年で仲がいい。
My cousin is the same age and we get along well.
夏休みにいとこの家に遊びに行った。
I went to visit my cousin's house during summer break.