Was I wrong for asking my mom to watch the kids?

Okay here are the basics:
We’re visiting my parents who live on the other side of the country.

We haven’t seen each other in about 2 years( we do FaceTime and talk on the phone)

We are staying with them for about a week.

Kids are 5 and 2. They are in their 50’s.

Last time we visited they watched the kids but said we stayed out too long. Honestly I don’t remember the exact amount of time we stayed out but we went out to eat and looked at a lake so if I had to guess maybe 4 hours at most.

Anyway, asked my mom if they can watch the kids and she said no due to above reason, they are not free babysitters, they wanted to spend time with all of us, and my kids don’t listen very well. ( they are toddlers so we’re still working on it)

I felt like I was wrong for asking. Was I wrong?