YOU SAID:
My cousin is hot because they play football
INTO JAPANESE
私のいとこはフットボールをするので熱い
BACK INTO ENGLISH
My cousin is hot because he plays football.
INTO JAPANESE
私のいとこはフットボールをしているので熱いです。
BACK INTO ENGLISH
My cousin is hot because he plays football.
Well done, yes, well done!