Hi Camile,
The one that is hissing is probably a female. This is pretty typical of an untame female. While you aren’t likely to be able to handle these birds, since they have each other for companionship, you can still earn their trust so they aren’t stressed or fearful around you. It’s OK for them to be in a family room, but make sure they aren’t in a high traffic area, such as near a door or entry to another room. This can keep them in a state of always being on edge, wondering when someone might appear next to their cage with no warning. Have their cage where they can see people, but can still feel safe and have their own space. Be patient with them, talk to them and spend time sitting near their cage, but without showing your hands. Since birds are prey animals, hands can scare them if they aren’t hand tame. Their main experience with hands is being grabbed. They should eventually get more relaxed around you, and then you can start resting your hand near the cage as you talk to them. When you feed them or need to have your hand in the cage, keep movements slow and talk softly to them to reassure them. Be patient and consistent and they will learn to accept you and hopefully the one bird will stop the hissing and threats. I’ll give you the links to our taming page and our info on bird behavior to help you more.
Teaching Your Bird
Pet Bird and Parrot Behavior
Thank you for asking Lafeber,
Brenda