Yes
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The custodial parent must initiate a petition for child support either through an attorney or for themselves.
of course
No, you file to have the custody and support order set aside.
Yes, the non custodial parent will have to file for a change in the child support for it to be lowered. The new child support will be based on the new income.
Generally not, however the non-custodial parent may file for modification of the support order based on changes in financial circumstances.
I doubt there were many child support laws back then. Normally, only the custodial parent of the child can file for child support, not the actual child.
Child support and visitation are two separate issues. The custodial parent can file a suit for child support but cannot deny the non custodial parent custodial or vistation rights is said parent wants those rights. That being said, the non custodial parent can file for custody or visitation regardless of whether the child support issue is addressed or not. Such matters are decided by the court if the parents cannot find an equitable solution.
No. Your custodial parent must file a complaint for a child support order in the family court in your jurisdiction.
You file for child support in the child's state of residence. All 50 states have reciprocal child support agreements and the agency in charge of child support collection will liaise with the state where the non-custodial parent lives to secure payment.
That issue is affected by state laws and court orders and separation agreements. You need to find the answer before claiming the child. In some states the working custodial parent has the right to claim the child as a dependent regardless if the non-custodial parent pays child support in recognition that the parent with custody generally spends more time and money on caring for the child.
The non-custodial parent can file for custody.