Like baby sitting or full time all day? If your providing food and changing diapers all day every for three kids charge high. Day cares get a tush load of money. If just babysitting a few hours 10$ per child per hour. So 30$/hr for up to five hours. If longer than that a flat fee of like 200$. If your doing like all day day care again a flat fee of 100-200$/day. Its fair, esp with three small children and better than most daycares.