It is not always the case though ,there could be circumstances that we have not been told about ,the mother has not said that the father cannot have the picture taken she has said she doesn't want them taken for her own reasons full stop ,i had to do this a few years ago when i had to leave my hometown and my family and friends! ,i had to make sure they were not put in papers ,my own family could not know where i lived ,this might not be the case with these parents but we do not know ,if the guardian asks pacifically for something not to be done then the school has to stand by them that is the law!