My 14yr old child asked to change the custody arrangment of every other week with each parent to live full time with my Ex-wife. We had shared the cost of private school and uninsured medical, I paid for all the medical insurance. Now my ex-wife wants me to pay 50% of private school, guideline child support and half of all other( add on) expenses. When we modified the agreement so my child could live full time with my ex she did not modify the no child support portion of our agreement. I continued to pay $1300 a month for school and the medical ins. In our orignal divorce agreement we did not pay child support but split agreeded upon costs like camp and private school. I could afford to pay for 50% of school because I did not have to pay child support.