Heric described his situation in another thread.

Anyway, I would recommend running this plan past the custody police if you think you would have the next few months off anyway. A   uninfluenced by other considerations and thinking only in the best interests of her son would probably leap at the chance for father and son to spend a lot of time together, at the end of a school year that is not too successful anyway. Now, given the situations this might not be what you are facing, but it is worth a try. mg