child support

I get child support from my ex because he is working and when we together we agreed I would stay home with the kids and he would earn, so he still gives me money for them. If the kids lived with him if I was still not working I wouldn't be able to pay so he would have to do it, but if I was working and he was at home with the kids I would pay him child support. I can't imagine this ever happening thankfully. My eldest likes to stay with him a lot, but he still pays me the money and I give him food for her when she stays.