Imagine the following:
In a weak moment, maybe while FCing a map or something you agreed to your mum's proposal that you would take care of the neighbor's 5yo son/daughter on saturday evening while your parents go out with the neighbors.
Incidently you have a >somewhat< important appointment that evening - for you at least, be it playing in a tournament that you can't reschedule anymore or the live-concert of your favorite K-Pop group being streamed or literally whatever could be an important event of your free time at home that doesn't happen regularly.
Now it is time - the neighbors bring over their child, tell you to take good care of it and leave with your parents. The period of time until the child has to go to bed is about 2 hours.
What possibilities for handling the situation would you consider? (even jokingly, because you don't have the means to actually go with them)
How would you most likely act?