Would you upset if the person who takes care of your kids is not there when you take them to them?

A situation happened to me where my sister in law was going to watch my kids while I attended this class. I had told her the previous night and also my husband told his brother which he asked her and she said yes. And yes we also pay her. Well the next day I went to her house to take them and nobody was there it was an empty house. Of course I called her she said her daughters were there I said no, nobody is home there were no cars. She said ok let me call them. So I ended up just taking them to my other sister in law which she did take care of them. I was upset with one of them because she could have at least told me ahead of time she wasn’t going to be there that way I wouldn’t have canceled the class tried seeing who can watch them.

I don’t live next to my family so sometimes it’s hard to look for someone to watch my kids. Both my sister in laws have kids and I know it can be hard with so many kids and a handful. It does suck I don’t live next to my family which makes it harder for me my husband works nights so he can’t do much. My class starts in the late afternoon so I’m out in the night. Idk I just felt she could have told me something ahead of time you know I am paying her it’s not free she did agree a day before. But oh well it happened