Ok, so this has happened a couple of times over the last few months. Well, since we've moved in together.... 
We had his dc Thurs, Fri & Sat, returning them on Sunday lunchtime. We have them again from Thursday this week too.
DP has had a text from exw saying that she has the flu and needs him to help out because she feels too ill.
Now then. I have dc of my own too - is it not part of parenting that when you're ill you just have to suck it up and get on with it? She lives with her partner - why can't he look after them?
DP has been off work yesterday and today and is home ill himself, btw.
I am so sick of being treated as emergency childcare on a whim. What can we do? Can he morally refuse? Will he? Obviously the father is just as capable of looking after his own dc as anyone, but he is ill, and they've only been back at home for 2 days.
This is getting on my tits now. I can give my opinion, but ultimately, I know he'll cave and have them for the whole week. I'm so worn out with it all.