File a petition in the court that has jurisdiction over the case.
This relates to someone getting a divorce. UCCA stands for the "Uniform Child Custody Act" which is a law that has been enacted by all 50 states that sets out the information needed in a petition or complaint when children are involved and is devised to have one and only one state have jurisdiction over child custody issues.
Most often the mother. JK Rowlin got custody there than took the children to England to keep the father from getting access rights.
As for Joint Custody of Them. See Bird Nest link And remember - you are not losing either parent.
To my knowledge, if a state agency is not involved because of negelct or abuse, your mother-in-law can get temporary custody if you go to family court and ask that she take temporary custody until you are ready to take them back; it could be because you are having financial difficulty, hospitalization or other issue that you need to deal with As far as your mother-in-law getting custody against your will, I don't think that can happen. If it is happening, you need to contact your local Child Protective Services.
If you are concerned about her taking the kids out of state, if they both have joint custody then it would have to be agreed upon by both parties before she can do so, if your seeking more thurough legal advice then you should consult an attorney.
Temporary custody yes, if the other parent, who's moving, has been granted permanent custody but has no place to live at the moment. If you are married and can't agree on custody you have to go to court and let the judge decide.
Getting custody and the right to leave the country are separate matters. see link
"Divorce lawyers just do a simple task of getting a divorce done. One divorce lawyer would do the same task as the next so that means they do not have to be as skilled. For example of a married couple wanted a divorce they would not need to find someone with a lot of skill because its just a divorce. on the other hand a custody lawyers will need more skill because they will be fighting for custody. So for example the mom would want the child so she needs a good lawyer and the dad would need a better lawyer to keep the child. You would want a lawyer with more skill to make sure you win the custody case, for divorce, no one is winning."
You can file with the court as a temporary guardian. Call the district court in your area for more details on getting the paperwork filed with them.
Getting a complaint resolved requires that the consumer have the appropriate documentation to substantiate a complaint. This documentation can be in the form of receipts, letters, etc.
That should have been expressed in the custody order, unless it's only a temporary order. see links
When you are getting a divorce, it is best to ask such questions to a divorce lawyer. You will be far better off to get everything done correct from the start. If you can not afford a divorce lawyer, a number of stationary stores have legal forms that you can use. Buy one of them. Do something sensible rather than use this!