See Family Code Section 3083 and read the Child Custody Order to see if it specifies that consent of both parties is required for medical or medication decisions.
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I have just read an appellate brief that would curl your hair, The child has ADD and Dad sounds God awful-- the kid fell 4 stories under his care--and there has been HUGE fight over medical issues. Why am I telling you this? Be cause you REALLY need to mediate this. yes I know I k now it seems impossible--but there are (thankfully) a few attorneys who SPECIALIZE in these difficult cases. Litigation tends to spiral out of control and both sides become MORE entrenched. PLEASE believe me when I tell you fighting is counterproductive.
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I agree with my colleagues, Donald and Edna on this case. Fighting with him most likely is not going to solve your problems and if it does, it will cost a lot. I recommend mediation and reconciliation.