I am the non-custodial parent of 18 & 20 year old children. The 18 yo just graduated HS and is not going on to college and will likely continue to live with the custodial parent. The 20 yo is a full time college student who live on campus during the school year, I split the tuition and room and board payments with the custodial parent. I maintain healthcare coverage for all of us. What is my child support obligation?