Ha -- It's things like this (which I also deal with constantly with my STBX) that make me happy thinking I will no longer be legally tethered to his stupidity. It's too bad it affects the kids, but they will all just have to learn through the experience.
My H can very expertly juggle his own business schedule. He just won't look at what his kids are doing. Because if it's convenient for him...... All that's coming to an end. I'm looking for ways to give him more responsibility for the kids, and this is a start. I should have done it years ago, I thought I was being a good wife by handling routine things freeing him up to make a living for us. Apparently, he had a little too much time on his hands......