How much should I pay him!?

This weekend my brother is coming over to take care of our animals and make sure our house doesn't burn down while we're gone pretty much. It'll be from Saturday morning to sometime Monday afternoon or midday at least. He used to live with us so he knows how to take care of our animals plus they have a doggie door so it's not like he's going to have to let them in and out we are stocking up on dog food cat food and pig food and we also want to stock up the fridge with food and drinks he also has TV and games to play so it's pretty much just going to be him living in our house for a couple days and I don't know how much to pay him? He may not even stay the night there but either way I trust he'll keep my animals alive and happy so it's up to him when he stays and goes lol. Any thoughts on how much he should get?? I asked him and my husband and they both won't give me straight answers