Those are long hours for you and for your grandson. The family must get up really early and perhaps your grandson is over tired which may make him more difficult at times. Does he have a sleep in the day? How old is the little lad? Of course you are worn out and you must say so. Lay it on the line. They must find a different solution. So sorry that you have this situation and hope it can be resolved very soon.
Are You Finding the Hot Weather is Making you Short Tempered?
