Is it illegal to have a shadow in your heart after your younger brother hits your sister?

It's not illegal to beat my sister if my younger brother is a minor ~ But if my younger brother is an adult, it's illegal to let my sister cause minor injuries or more. Those with minor injuries will be punished by public security, and those with minor injuries or more will be suspected of criminal offences. Legal basis: Law of the People's Republic of China on Public Security Administration Punishment? Article 43 Whoever beats another person, or intentionally hurts another person's body, shall be detained for more than 5 days and less than 1 days, and shall also be fined from 2 yuan to 5 yuan.