<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
Should I tell my mom that my brother snuck out the house?  I don't want him to be mad at me.
<|assistant|>
It is likely that your mom will be more angry with your brother for snuck out than with you for telling her. It is best to tell her the truth so that she can keep an eye on him when he's out and make sure he is safe. Your mom might also appreciate that you are being open and honest with her.