Did you get help from your mom or MIL to watch your baby 1-2 days a week when you went back to work? Did you PAY them???

My husbands mom is watching our 3 month old/ her three month old grand baby (only grandkid in the family) 1.5 days a week since I am back at work 2.5 days a week now. Have you been in a similar situation and did you pay them? If you did was it hourly? A flat fee, etc... ???