Yes
Can the custodial parent ask for child support for her children past the age of 18 if the children are full time college students?
yes
Child support is paid as long as the child is a minor, get emancipated or when the child support agreement says so.
Yes, being granted full custody does not relieve the other parent of their financial obligations to the child(ren).
Yes, back child support is paid until paid in full, regardless the age of the children. There is NO statute of limitation when it comes to child support.
If you have full custody of one child it's the other parent that should pay you child support for that child. You need to go back to court to correct this.
If the support order included a provision continuing support while the child was enrolled in college it does not matter where the child is living, as the support is to reimburse the custodial parent for the non custodial parents share of the child's expenses. If the child is attending school the custodial parent is likely still paying expenses for that child regardless of where they are living
You can be ordered to get a full time job. see links
Yes, of course. That is the purpose of paying child support: to help the custodial parent pay the costs associated with raising the child. Both parents are responsible for supporting a child and the non-custodial parent must support the child financially.
For the state of Tennessee, yes because it depends upon the wages and amount of days spent with each parent.
Yes, the status of the obligated parent is irrelevant.
Child support payments are calculated depending on the non custodial parent's income. If the non custodial parent is only working part time, they might be required by a judge to seek a full time job.