Yes, roos can be friendly - never mind, oldhenlikesdogs as beaten me to it! - thanks
I had a rooster that behaved this exact way, and I kept him because he was not after the humans....until he got me in the leg with his spur. Its probably a minimal injury as far as roosters go. But his spur went through my jeans, which now have a small hole in them, and my leg has a hole in it as well, and was badly bruised. Your children are sitting so it would not be their leg, it will be their face or their chest, and they are small. I cried, it hurt. They really don't need to go through it. Just trying to give friendly advise, please don't take the wrong way, I just would hate it if he got them.