Since your question relates to deciding the custody of a minor child between two parents, the answer is that such question should be decided by the court and not by the police.
A private person can seek sanction for prosecution of police officers by writing to the State Government (write to the Home Secretary) giving all detailed grounds.
If the high court has rejected your petition and you feel that you have sufficient evidence to support your stand, you can definitely approach the Supreme Court for pressing the criminal charges. However, for getting the custody of the child, you may approach the family court first.
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