YOU SAID:
let me smash your mum
INTO JAPANESE
私はあなたのお母さんを粉砕させて
BACK INTO ENGLISH
I let you crush your mother
INTO JAPANESE
私はあなたの母親を粉砕させて
BACK INTO ENGLISH
I crush your mother
INTO JAPANESE
私はあなたの母親を粉砕する
BACK INTO ENGLISH
I crush your mother
That didn't even make that much sense in English.