Childcare Needed - Now Hiring

I am a notary , loan signing agent and also do out and do commercial inspections while still having to be a mother , so I am seeking someone that can be on call for my booked appointments so they can watch my two little ones for maximum 2-4 hours while im at the appointment. Please note I dont always have booking everyday this is why I need an on call incase husband is also working and I have no one to watch my babies I have a 2 & 3-year-old and my two older kids are 11 & 8 but I tend to make and complete my appointments while they in school so it doesnt interfere with me picking them up