YOU SAID:

My brother did not find my mother who was angry and asked to stop yelling

INTO JAPANESE

兄は母を見つけられず、母は怒って叫ぶのをやめるよう頼んだ

BACK INTO ENGLISH

My brother couldn't find my mother and she got angry and asked me to stop screaming.

INTO JAPANESE

兄は母を見つけることができず、母は怒って私に叫ぶのをやめるよう頼みました。

BACK INTO ENGLISH

My brother couldn't find my mother and she got angry and asked me to stop screaming.