frankly,
I would have just flat out told the other mom, that the issue is not your children,
that the true issue is this younger child, whom believes that if he arrives at the stop first then he should get on the bus first.
Unfortunately reality is that the bus company nor the school have assigned this rule
there is a reason,
Because there is no such condition which would make you first .
Its important to explain this to her child,
What happens if a 7th or 8th child enters the group?
you should not have to constantly entertain his childs notion of reality, and appease his needs.
you are very kind to do so,
and if it were me i would just be out on the corner waiting
and let the kids fight it out,
if she says anything tell her to talk to the school and they'll tell her how absurd her request is.
if he wants to be first he should stand at the curb in line waiting, and hopefully the bus will stop immediately before him which is not usually the case.
Its important for him to realize that just because your kind enough to go along with the newly created rule , others more probably will not.
M
EDIT:
Just read the comments
Personally to go as far as making a yearly calandar is just going too far, what happens if another child moves into the area?
Yes its silly, yes we want to get along, but when does this little guy learn every thing in life is not fair, not everyone will care about his feelings FIRST.
and By the BY by fight it out I meant merely to work it out themselves,