YOU SAID:

if my uncle kills your uncle but your uncle kills my uncle whos uncle actually killed whos uncle

INTO JAPANESE

私の叔父があなたの叔父を殺したが、あなたの叔父が私の叔父を殺した場合、叔父は実際に誰を殺したのか

BACK INTO ENGLISH

If my uncle killed your uncle, but your uncle killed my uncle, who did he actually kill?

INTO JAPANESE

私の叔父があなたの叔父を殺したが、あなたの叔父が私の叔父を殺した場合、彼は実際に誰を殺しましたか？

BACK INTO ENGLISH

If my uncle killed your uncle, but your uncle killed my uncle, who did he actually kill?