We were alternating years claiming our son on taxes, Can my ex claim our son on his taxes after child support has ended? Son is 22, full time student living with me.

Divorce decree ordered alternating years on taxes.

Ex has not paid support in over a year, since my son turned 21.

My son has lived with me full time and commutes to college where he is a full time student.

Both parents pay 1/2 tuition. Ex has son on his insurance.