Do you pay them?
I'm very lucky in that dd's grandparents look after her for 5-6 hours, two days each day a week while my dh and I are at work. The subject of money has never been mentioned; they would probably decline anyway on the grounds that they really enjoy it, and do not need the money.
However, dh and myself feel a bit awkward about this, especially as we could afford to pay them, and are fully aware of what the equivalent nursery fees would be.
What would/do you do?
TIA