I have parents paying me at all different times. A benefit is I'm always getting paid It can be a little confusing, but I keep a separate calendar to make it all down.

I had one family switch from after to before care pay and I had said that I was having issues with other people not paying on time. I also had a new family start, so I had them on the new schedule.

You could ask them why they are reluctant to switch-if it because of the double payment as mentioned above you could offer to wait until one of you is on holidays to make the switch?