YOU SAID:

i have no idea y my mum is dead

INTO JAPANESE

私にはわからない y 私の母は死んでいる

BACK INTO ENGLISH

i don't know y my mother is dead

INTO JAPANESE

わからない 母が亡くなった

BACK INTO ENGLISH

i don't know my mother died

INTO JAPANESE

私は母が亡くなったことを知りません

BACK INTO ENGLISH

i don't know my mother died