I have to ask, and I am not trying to offend you in any way here, but why is he not letting you charge for your photography (assuming your skill level is to the point where you should/can be charging) if you are healthy enough to do occasional shoots? What would the difference be? Like, if you are able to do one photo session every two weeks why not charge? (I do not know your health status obviously or what it is that may be preventing you from doing photography more often). I guess I am just confused, but in no way am I expecting you to divulge personal info on a forum.