That should have no effect.
In this case the other parent is no longer the custodial parent. If the child is now staying with another guardian, they are now considered the custodial guardian and child support should be paid to them.
In general, the parent or guardian with the most parenting time is eligible to receive child support from the non-custodial parent. You do not need to be the child's biological parent to receive child support.
Yes. If the legal guardian has custody and is not the biological parent, the biological parents have to support their child and pay her for the child's expenses.
No, child support is only owed to the custodial parent/guardian. If the grandmother has become the custodial guardian, child support will be owed to her, instead of the mother.
No. The guardian of a minor child cannot "relieve" the parent of their child support obligation. That power is reserved for the courts. If the guardian doesn't need it to help support the child then it should be deposited into a trust with the child as the sole beneficiary at college time.
You must file to stop child support along with a change of custody.
If "non biological parent" means, unrelated but legal guardian of the child - yes.
A minor child can make a claim against their deceased parent's estate through a court appointed guardian.
As he's on SSD, none at all.