Babysitting Rates

Hi all! I taught kindergarten for seven years but have been home babysitting since I had my two kids. I have different hourly rates for children depending on their age (0-5 months, 6-18 months, 19+ months). I am flexible with hours, never overcharge if they’re late or early, and don’t charge if they’re sick or don’t come. I write up our day in forms for the parents, keep parents informed via text with pictures, and plan the days to include educational pieces (numbers, letters, shapes...), sensory, music, dance, yoga, and art daily.

My question is, what would you feel is a reasonable hourly rate for two brothers (6 months and 18 months). I want to be fair to the family but also respect my educational background and all I put together in planning our days.

Thank you!