Sil charging for one off babysitting

[Dalalalada]

I feel quite angry about this and i probably shouldnt.

I habe never asked her to babysit and tonight the sitter pulled out at the last min, and we are going out for my birthday tonight tickets are bought and paid for.

I was panicking trying to find somone else on the sitter site and dp called sil who will be at home cause her partner is out.

She said she would need payment!

For some reason its really rubbed me up thr wrong way!

Aibu?

Next time she asks for a favour tell her you expect payment.

I remember being a single mum on benefits years ago
The kids where in bed one night,the shop was a 2 minute walk away
I checked the fridge and found I’d ran out of milk for breakfast in the morning
My sister in law was sat on my sofa,enjoying a cuppa and eating my snacks so I asked if she’d mind sitting with the kids for 5 minutes while I ran to the shop
‘No problem-I’ll spend the tenner you’ll owe me on chocolate for your brother’
Er,ten whole English pounds for 5 minutes of babysitting?
I don’t think so-I chinned her off and the kids had toast in the morning

They’ve got a kid of their own now and can’t understand why nobody wants to do favours for them for free