Is Michael Afton Foxy's bro?

Are you suggesting that Michael Afton, a character from the popular video game franchise Five Nights at Freddy's, and Foxy, another character from the same series, are related in some way? It's important to clarify that these characters are fictional and were created by Scott Cawthon, the developer of the game. In the context of the game's lore, there is no direct evidence to suggest that Michael Afton and Foxy are brothers. So, unless there's some hidden information or fan theories that I'm not aware of, I would have to say that based on the information provided, Michael Afton and Foxy are not brothers.