So, after my rather misery-filled (slightly rageous) post of whenever it was, yesterday or whatever, I have now got an update. I still can't do the choir, and not even arrive late and go just some weeks because, and this is the main point, my hours have been finalised and rather radically altered.
I'm now working 31 hours a week (paid extra to the original rate by a very good percentage) which includes every weekday evening, two weekday mornings for 1.5 hours and some afternoons. Anything on the weekend will be paid extra. I am kind of hoping that I will be taking the eldest daughter to her piano lesson on Saturdays because I enjoyed it and it got me out of the house, plus I like Lily and I won't be taking her to school any more.
I've got mixed, but mostly positive, feelings about this - on the one hand I don't have to get up at 7am every day any more! And I know what my hours are for definite, rather than not really being sure. On the other it will only serve to exacerbate the problem of the fact that I live here but am an employee, which is a distinction hard to draw in the minds of four year olds and, it has to be said, of me. I enjoy talking to the children and that doesn't stop at 8.30pm on the dot! And if one of the little ones asks me to pour them some cereal in the morning, I am not going to say "sorry, I'm not working at the moment" but that is part of my job when I am working, so where is the line?
On the advice of a bunch of you, I mentioned the issue to my employer and she is going to think about it and we'll chat again tomorrow, because we ran out of time today. I think we cleared the air a lot today because there were some things she was a bit concerned about (which I sensed but didn't know what they were) and I was upset about some things she hadn't thought of.
So all in all I think things will work out well. Another reminder that the best thing to do with a problem is to wait until it resolves itself.