my brother stole 5 dollars from me

My grandma gave me Christmas money awhile ago and i still had some left. Anyways, i made the mistake of leaving my money in the living room and 5 dollars went missing. I know my brother stole it cause i found 5 dollars in his room and it was folded the exact same way as the rest of my money. Im not even mad, but i kinda want payback but i also don't want any confrontation. What should i do?