My DC's school was having a week of special events around books and reading. We live in France and they asked me to read the children an English book as one of the special events. Another mum who is an author spoke to the children about her job.
The school put up a notice listing the events on the parent notice board. They referred to me as "DC1 and DC2's mum". The referred to the other parent as "Madame Surname, author". Isn't this a bit rude? Shouldn't they have used the same mode of address for both of us?