After the birth of our daughter I plan on returning to work. I am going to have my sister-in-law take care of the baby when I am at work. I told her I want to pay her, but she wouldn't give me a "price"--just "whatever we are comfortable with". Help! I have no idea what to pay her. We cannot afford paying a professional caregiver, however, I don't want to offend her or have her think I am unappreciative.

How much do you think I should pay? Or should I figure out another way to compensate her?