YOU SAID:

i like my friends "cousin

INTO JAPANESE

私は私の友人"いとこが好きです

BACK INTO ENGLISH

I like my friend' cousin

INTO JAPANESE

友達のいとこが好き

BACK INTO ENGLISH

I like my friend's cousin

INTO JAPANESE

私は私の友人のいとこが好きです

BACK INTO ENGLISH

I like my friend's cousin