You're the adult while I'm gone. Take care of your brother, he's looking to you for protection now. I won't be gone for more than a few days to gather food and supplies. If for some reason I haven't returned after a week, take your brother and head to the Pittsburgh Quarantine Zone.
Don't open the door to anyone but me. Save your bullets. If you have to leave, stay low and move quickly. Use your size to your advantage.
I'll see you soon.