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I am sorry to hear about this situation. Absent an order in the custody decree, the parent who has custody of the child at the time is free to take photos of the child, and, to share them as he/she sees fit.
To stop this, she would have to file for a modification of the custody decree, and specifically request that the court modify (and add) to the decree that he cannot share photos, and why (and show good reason as to why she is requesting it). Link to sample petition for this HERE.
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