You will need to get them fixed before bringing anyone new home.Not spayed or neutered yet. They get along fine, they're both playful, and don't mind sharing food or the litter box. When they play rough, I get worried because the bigger cat is fat and heavy where as the little one is so tiny in comparison. Due to that reason we keep them separate at night but other than that they get along well. Financially, it is not a problem. Just worried about how they would all get along, especially since the two males may fight.
You will need to get them fixed before bringing anyone new home.