effalump
Would any of their friends' parents help out for something in return eg, baking a cake or buns each week, or Artisan bread? Do you have any skills that might be useful that you can use as a thankyou?
These are not the OP's children, they are the parents' responsibility as is the house cleaning.
I doubt anyone would take on house cleaning and hours of child minding in exchange for a few buns or a loaf.
The going rate for either is at least £10 ph, more in the Home Counties.

