YOU SAID:
they did surgery on my dad
INTO JAPANESE
彼らは私の父の手術
BACK INTO ENGLISH
They're my dad's surgery
INTO JAPANESE
彼らは私のお父さんの手術
BACK INTO ENGLISH
They are my father's surgery
INTO JAPANESE
彼らは私の父の手術です
BACK INTO ENGLISH
They are my father's surgery
Yes! You've got it man! You've got it