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If the parents have joint custody, this means both parents have input and legal rights to know about all major decisions impacting the child. Thus, one parent cannot withhold such information from the other child and if the parent is not letting your friend get information, your friend's recourse is that they have to file a motion for an order to show cause for contempt of court against the other parent to force her to turn over the information regarding the hospital and access to the information so that the father can get the information they are allowed by their legal joint custody rights.
Furthermore, if she is committing the child to a behavioral facility, this is proof she cannot handle the child and it is grounds for the father to file a motion to change custody and seek to become the custodial parent
because it shows she cannot parent the child.
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