Yes, you can keep chickens, ducks and geese together. All of my animals are together. As far as can they be brooded together........... If I am understanding your question, you're asking if once they become broody, can they all be together. Well, I don't know about that. I think that would be difficult to do. When all of my animals go broody, they are setting in different places. I have outside brooders for the chickens. The ducks are have separate brooder quarters (dog kennels, etc.) and the geese also have different brooder quarters (dog houses). My ducks and geese still need an area large enough to bath in and place their heads/bill inside and unders. The dog kennels are large enough where I can put large containers of water inside. The ducks and geese get a little more agitated as far as visitors going into their living quarters and putting food and water in. The chickens are really not bothered. They just go with the flow. I'm not sure if that helps you. This is just my experience.