Me and my sister work together for a family run business. She has only recently started working there it's been hard, but it's another story.
She sent me a text message yesterday saying 'we need to discuss childcare for half term' I just replied with what do you mean?
She wanted to arrange childcare with me to balance it so I had her to DCs on her days and she had my DS on my days at work. I am recently pregnant and have suffered recurrent miscarriages and currently suffering anxiety plus other problems so I am seeing a consultant who has advised me to take it easy so I am not prone to stress. This would leave me with no break. Also I am awaiting a letter for my scan which will be in the half term so I cannot guarantee days yet.
I said to her, I am awaiting a hospital appointment and that I have arranged childcare for one day and after that I only have four working days during half term which I have said I will take as holiday to enjoy time with DS. He is four so is too young to attend any of our local holiday groups. Her eldest DC also fights with my DS a lot, calls him names etc and I do not want my DS spending the whole Of his half term with this environment. I want him To enjoy it.
I advised her to use the holiday groups and that she could claim it back on tax credits but she said it's not something she can afford until they paid it back. I didn't know what to suggest. She said to me that if that is what my plans are for half term she would 'let mum know' 
it made me feel like I was going to be in bloody trouble!
Just this evening she has text me at 5:30pm saying shit it's strike tomorrow can you have DC. I have been extremely stressed these last two days have big problems with DP and planned to take it easy just reading a book. If her DCs were well behaved it would not be a problem but I know this is just going to be an awful day and then back to work again. It is my first child free day in ages as I have my other DN every Wednesday on my day off.
How has she only just realised it is strike tomorrow.
Now if I say no I will be completely in the wrong and moaned about to mum FFS!! I don't even have an excuse apart from I just don't want to! Is this really unreasonable of me, I really don't know.