Laundry, Laundry, Laundry
Infants are tiny, but what they lack in size, they make up for in messiness. Spit-up and diaper-related accidents cause newborns to plow through more clothes, sheets, towels and blankies per day than the rest of the family's dirty laundry combined.
Your in-laws have decades of laundry experience under their belts, so let 'em lend a hand to keep you and your family from wearing clothes that smell like old gym socks. You might also request nicely that some laundry be done every day to avoid intimidating pile-ups when you're back on dirty clothes duty.