I am very lucky with these children 4 and 5 - they don't row or lose tempers. I am not sure why. I certainly remember one older one being very difficult at this age. Good luck with the shopping.
I think the child (I should say adult) is going to pack today as they are off to a theme park tomorrow, not the park I said earlier. Luckily I have never been to one so I muddle them all up and tomorrow would have been his last day.
What I do remember was how long it took their sisters to pack the car on the day (hence my enthuiasm to do it the night before this time or at least have most of the stuff by the door) and particularly as there is an absolute deadline later in the day when he has to be at his department leaving on a coach for the field trip.
I do think considering what to take well in advance is a good idea. Eg I dropped him off at the tube. It was pouring and for once he took the umbrella in the car so that's another thing worth taking - an umbrella but I won't remember -they should put the items aside when they think of them, not expect to remember at the last minute. Anyway everyone is happy and calm so no problems.
Ah yes have to wake one up for hair cut and another for the dentist...... so at least the one packing today should be back by 11 to pack. We had to look out the school vacc. records for a friend of theirs yesterday from school. In 2016 they had the menn c + other ones vaccination at school so that's all done.