YOU SAID:

haha would hit the underside of his chin

INTO JAPANESE

母は、あごの下側に当たる

BACK INTO ENGLISH

Mother is on the underside of the Chin.

INTO JAPANESE

母は、チンの下側に

BACK INTO ENGLISH

My mother is on the underside of the Chin

INTO JAPANESE

私の母は、あごの下側に

BACK INTO ENGLISH

My mother is on the underside of the Chin