When a party seeks a modification of a custodial arrangement, the party generally needs to show a substantial change in circumstances and that there is some harm to the child in the current arrangement.
As of now, you have not stated that there has been any change at all. The only basis for the father's request for a modification is that he wants the arrangement modified, it is highly unlikely that the court would grant a modification solely based on the father's changing perspective.
While it's always difficult to speculate as to what a judge might do in any particular situation, my opinion is that the father will not prevail in this situation.
Please let me know if anything requires clarification.
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