Truth is, if he'll go after your daughter he'll go after anyone. And one person training a rooster to behave has never made sense to me - even if it works, it'll work when she's out there. He may learn to respect her but everyone else is fair game.
I had to face a hard situation here last year. I had a much beloved rooster, Scout. Oh, he was world famous for awhile. He was hatched under a broody, but after an injury we had to bring him in and hand raise him. Scout's full story:
https://www.backyardchickens.com/a/frostbitten-feet-the-adventures-of-scout
Despite his disability, he was a great rooster...handsome, strong, good provider, early alarm system for his girls, and he was always a little wary of me. Because of all the stuff I had to do to get him better, he pretty much avoided me. I'd walk out there bold as brass, and as I'd approach he'd simply and quietly move out of my way. Good rooster! He liked my husband just fine - he'd even come over to see what Ken was doing. The coop was pretty peaceful. I have two young grandkids who help with the chickens. In fact, Katie is so good that when we leave town she's totally in charge of the chickens. She started that when she was 8,and she's now 10. Our grandson (now 11) isn't big on the chickens but he can take care of them just as well as Katie does. We also have a sweet little granddaughter, 4 year old Kendra, who was born with Spina Bifida and she's been in her wheelchair since she was 9 months old. She can't do much out there, but oh, how she loves to be out there and see the chickens!! I vowed when I placed my first chick order that I wouldn't have a chicken out there I couldn't trust 100%. Not only did I want to avoid any injury to those amazing kids, I also knew that I never wanted them to be afraid to be outside because of the chickens.
I went out to do morning chores on June 4th. There was a piece of plastic stuck in the litter and I bent over to pick it up so the birds wouldn't peck at it. I didn't even see Scout coming! He attacked my hand so badly I still have the scars. He'd never done anything like that before and I didn't know if he would ever do it again. I was stunned. Was he startled by the combination of the rustling plastic and my hand? Had he been waiting for months for an opportunity to get me back for all I'd done to him? Was he simply getting mean? I didn't know, but he obviously had a thistle in his kilt. I did know that as of that moment I could never trust him with the kids. What if Katie moved faster than he wanted? What if he suddenly decided Kendra's wheelchair was a threat? So, by the afternoon of June 4th, Scout was on the shelf in the refrigerator.
Whether to work with a rooster or get rid of him is totally a personal decision. You know your situation and what you'll put up with better than I do. Depending on how many girls you got in your last chick order, it seems to me that 3 roosters could be pushing the hen/rooster ratio and could be inviting trouble when those male hormones get to raging and there aren't enough girls for that many boys. Competition is sure to set in, and they don't care what they take it out on. I talked to a lady recently who has a rooster who was just fine until she added a young roo. Seems the older one has now taken a dislike to the outside faucet. He attacks it over and over again. But she says he's such a good rooster and makes such beautiful chicks. Now, to me that rooster has a screw loose and I'm darned if I'd want to produce more chicks with loose screws, but she "loves Jasper to bits". So he stays, and continues to attack the faucet. Silly chickens!