Towards the end of the clip it got really rough, a dog got her hand and was pulling her in a very awkward position. They had tried to drag the son away many times and were trying to get hold of his limbs. Was it play? Yes, but it was the fact is they were out of control and could have badly hurt that kid.
I love dogs and used to work with animals. I've seen dogs like this in person, and if you don't know how to get them under control it can get serious VERY quickly. The dogs will start to get frustrated and play will turn to aggression. This video is another case of a crappy owner who didn't train them, socialize them and keep them safely contained in the house/yard. I hope the dogs find a good home instead of getting put down.