Should I tell my mom that my brother snuck out the house?  I don't want him to be mad at me.
user
It might be best to talk to your mom about this, as it could be a safety issue and you should try to help them maintain an open dialogue. However, if you decide not to mention it, just make sure your brother understands that what he did was not okay and that there could be consequences for his actions.
assistant
Should I tell my mom that my brother snuck out the house?  I don't want him to be mad at me.
user
It is likely that your mom will be angry with both of you if she finds out, so it might be best to tell her yourself. That way, you can explain the situation and hopefully mitigate some of the consequences.
assistant
Should I tell my mom that my brother snuck out the house?  I don't want him to be mad at me.