Don't be so quick to blame your brother. Some chickens are not fond of people, no matter how they were treated as babies, and regardless of breed. Even if he did not handle her gently when she was a baby, that may not even be related to her behavior now.
You should try bribing them into the coop instead of chasing them. It's SO much more efficient and fun for them vs stressful. Even if it doesn't work the first day, they will soon realize that the sight of you with the treat cup or whatever means FOOD! In addition, you can cash in on the fact that chickens tend to do what other chickens are doing. If one of mine runs into the coop, they tend to start to follow.
Sometimes no matter what you do, a bird just will not be your friend. Sorry. I have got one that would rather die than come into contact with a human and she was treated like a princess from the moment she hatched in my house. She just doesn't like people, and that's okay. I have others that allow themselves to be picked up and cuddled and it just is what it is. It's not a reflection on you of some failing on your part as a chicken keeper. You just can't charm all of them. Sometimes the harder you try the less they want to do with you.