Hi, and welcome to the community. It sounds to me like this is hormonal behavior. She is at a perfect age, mature wise, to mate and lay eggs. You are correct that she most probably is considering your brother as her mate.
Here are some suggestions for you both....never touch her in any place but the top of her head giving scritches when she is into hormones. Yes, the hissing could turn into biting, so watch carefully for her lunging toward your hands to bite, and she also might decide to fly around the room and dive bomb for your head or hair. She also will do little rituals in the cage bottom. For example my hen tiel used to line up pieces of her fresh veggies, and seeds, in a straight line along the side of the cage bottom. Her pooos will get more watery. She may spend time on the cage bottom nesting...sitting in the corner. When that happens,she may be going to lay an egg. So watch her carefully. Be sure to give her plenty of cuttlebone and fresh green veggies like kale and fresh green leaf lettuce. She needs these so that if she does lay an egg or eggs, the shells will be hard, and she can push her egg out easy. Hens do not need a mate to lay eggs. Since she has a close bond with your brother, that is all it takes for her to lay an egg when she gets hormonal.
Give her about 12 hours of sleep at night. Do not feed soft foods like bread or cooked foods. Hormone time is stressful for her and for you adults. It usually lasts a few weeks. If she does lay an egg, do not put it. In a nest. Put any eggs in a cage corner on a paper towel. Do not throw any eggs away. Let her have her eggs for about 21 days, or until she abandons them and no longer pays attention to them. Then discard them.
It is well known that single hens who lay eggs can become chronic egg layers, which means she can lay eggs every few weeks, rather than months. Adhering to these suggestions will help you to better understand hens and egg laying. It is just a natural happening. Some single hens will never lay eggs. Others will do so. Often times those hens who have a close bond as does your brother will be the egg layers.
I hope this info is of help to you. We will welcome updates anytime.
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