There is no such standard.
There is no such standard.
There is no such standard.
There is no such standard.
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The most likely scenario is that the children will live with the other parent as long as that parent was not deemed unfit while the custodial parent was alive. If that parent was denied custody for cause the courts may consider another gaurdian should the non custodial parent still be considered unsuitable.
Sure, if the custodial parent agrees to it. If not, then the non-custodial parent would need to petition the court for a change of custody.
If neither parent still live in the original jurisdiction, it can be transferred to the jurisdictions of either parent.
Unclear of the intent of the question, but see related question.
There is no standard. The policies vary from state to state and from jurisdiction to jurisdiction. There are no universal standards in family law. See the discussion page for some examples from various jurisdictions.
It seems unlikely that a non-custodial relative would have "standing" to request a change in child support.
In some states, if the custodial parent moves more than 65 miles "as the crow flies" from the original address at the time of the custody agreement and does not get written permission to do so from the non-custodial parent, the court can (and sometimes will) remove the child and place him/her with the non-custodial parent. At that time the non-custodial parent will be given full custody of the child and even if the first parent moves back, they probably will not regain custody again.
no
for what?
Yes! Why would you want to keep that from the "custodial parent" anyway?
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.