My dil's family does the same thing for my son and his wife. He has MS and she has post-polio syndrome so a lot of strenuous activity is out of the question. Her family will all get together three times a year, spring, mid-summer and before winter sets in. They all gather at their house and pull weeds, rake leaves, wash windows, etc. She cooks them a lovely dinner as payment and they do it all without asking. Truly a lovely family.