My ex and I agree to equally pay for cell phones, car insurance and 1/3 for college tuition and expenses. Duration for post secondary education is until 23rd bday or graduation. What should duration of payments be for car insurance and kids cell phone bills? I thought to do until 18th bday for cell phones. 23rd bday for car insurance, if pursuing post secondary education. An attorney told me cell phones and car insurance need to be until 23rd bday, per statute.

What should duration be for me to pay half of kids cell phone bill and half of their car insurance? Thank you!