I will admit that a rooster had cut my day time predation. They have no effect on night time predation. BUT they are not effective protectors until the roosters are over a year old. Until then, they are only interested in one thing. The juvenile roosters are not protectors of the flock.
Now, if you are on a farm or a ranch, where the birds have their own space, and your children play a long ways away from them, then I might have a rooster.... but I would go back to where I got these chicks, and ask fro a rooster that grew up in an established flock, and who is so darn nice he just did not quite get culled, and he would be over a year old...but I would not add him until my pullets were laying.
Free ranging is nice, but really, once the predators find you, the losses can be heavy. more than once, I have have been nearly wiped out. These sound like expensive birds, I would be building a good run for them. Then let them free range until you get hit, then lock up. Sometimes it is just nice to be able to lock the birds up for their safety.
However, if your children share the yard with the birds, are even if their space is close to the bird's space, I would not have a rooster, and I damn straight would not have a free ranging juvenile rooster. Roosters have ruined the whole chicken experience for a lot of kids.
I love having a rooster, have had several roosters over the years, two were outstanding flock masters, 3 were so-so, 1 was a nightmare. However, my grandchildren come frequently, I have an old boy we call Captain, he is not aggressive, but I keep a very close eye on him, when the grandchildren come to help me with chores. Get down on your knees and see their perspective. Claws to the face...not worth the whole damn flock.
I hope I have been helpful, and of course, they are your birds and you can do what you need to, but do be very aware. Not all roosters are violent, but if you spend some time on this forum, you will find countless posts of where the 'darling' turned into the nightmare in an instant. That more than likely is not true, but they just did not have the experience to recognize the signs.
Mrs K