It's dependent on the custody order, but it's not appropriate for either parent to have a live in.
There is no law addressing this specific issue so it must be addressed in the court orders.
It seems unlikely that a non-custodial relative would have "standing" to request a change in child support.
It is not an automatic switch. However, the non custodial parent may file to take custody. If this is not an option another family member may step up.
You must go to the family court to see about getting the custody changed.
Then the child should petition the court (or have the non-custodial parent petition the court, more likely) to modify the custody order. If the custodial parent is "gone for most of the year" and leaving the child in the care of someone else, the court will probably consider that a significant factor.
Yes, if it's the home of the other parent.
for what?
Yes! Why would you want to keep that from the "custodial parent" anyway?
Unless visitation rights for the non-custodial parent were allowed in the divorce paperwork, the custodial parent is completely within their rights to deny the non-custodial parent visitation....however, the non-custodial parent may sue for visitation rights.
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No. The non-custodial parent needs to have the visitation rights enforced by the court if necessary.
The custodial parent is the parent with custody/guardianship of the child.