I think bc you've allowed it to go one for so long that the parent might not understand that opening time is at 7:30am and not before. I would explain at pick up today that doors will be locked until 7:30am then will be opened at such time. Then hand out your new updated PHB. Let them know that it states very clearly your opening and closing times which they signed already and there has been no change to that. If they would like a change to drop off discuss on what you think is fair regards to time and addition to pay also. If you are having to work more time then a fee shld be attached. If they would like to pick up early so as not to pay a fee...you can decide on that as well.
