This didn't occur to me until I went online to look at my cable/internet bill....
When our child is with me, he uses my WiFi for his phone so the data plan isn't even being utilized (I researched several sources to make sure that there wasn't any kind of activity that would charge the data plan instead of my WiFi).....therefore, any data that our child uses is when with Dad, not me. I don't allow our child to bring the phone in the car or when we go places b/c there is starting to be a huge dependence on playing games, you tube, etc. and I would like for our child to socialize occasionally instead of being focused on the phone morning until night. I even have printouts showing how much usage there is on my WiFi network on days the kids are with me compared to days they are with him (it's a HUGE spike). So now I really don't think it's fair that I split the phone bill because of data that is being used by the four people on the plan and none of it occurs when at my house.
I also went to the school's insurance site to compare their plans again. I took the most expensive plan available and calculated the childrens' portion of the premium. One child's portion would only be $80 on the most expensive plan possible which is still less than what he was asking me to pay. He may not like it, but I'm going to stand my ground on this because it's not fair. Not going to court over it on my part but I'm also not going to just give in now that I know what a difference there is between what I'm being asked to reimburse and what the most expensive option is and the fact that phone usage at my house doesn't even use Dad's data plan.
Dad thinks that I'm just being cheap and don't want to pay anything for the kids and that's not the case. I just want to pay my fair share, not mine plus part of his, especially when these things were decided solely by him without my input and in one of the cases I had offered a better and less expensive option.