I agree with the others that your hen is probably slowing down due to molt. The rooster, though, I would get rid of. Even if you are able to get him to respect you by trying various taming methods, there is no guarantee that he won't go after your kids. And they are FAST when they want to be! I just visited with a lady this weekend who had to kill her roosters because they went after her and left her bruised from her hip to her knee. Fortunately she was apparently wearing long pants when she got her. They had pretty good sized spurs!
We had a steer once - his name was Butch (My boys named him. They were around 10, 8 and 5 a the time. The reason for the name? "We're gonna butcher him anyway, Mom."} That animal thought he was a horse, thought he was a deer, thought he was a dog. We got him as a week-old bottle calf, and he was pretty much raised with my horses. He would break through any fence he was in, no matter what kind - electric, barbed-wire, boards, we tried them all - when we took the horses out. If he got out soon enough to see where we went, he'd follow us down the road, bellering his head off. The first winter we had him was record-breaking snow. We had a herd of deer that would come try to find grain around our bins. One day we looked out the window to see Butch following the deer as they headed across the field after feeding. One afternoon my mom stopped by while we were out riding. Butch had gotten out and was laying next to the back doorstep with the dog. When we finally took him in to be processed, my aunt asked me, "How can you eat Butch?" I told her, "When I think of every fence I had to put back up, he tastes better and better!" All that to say, if you're struggling with killing your rooster ("culling" means to simply remove from the flock), think of the attacks he's already made, and then imagine them getting worse. Imagine one of your kids scarred for life - physically and possible mentally - by those spurs coming into contact with their face.