Baby-siting money

Hey guys thought I would just ask so y'all know coronavirus is around and my aunt's children have to stay home with her but she has to work so she asked me to babysit them a couple of days of the week. I also have online school I'm in nursing school nearing my final semester it's has been more work actually since it is online now.She has 3 kids a 16 year old,a 9 year old girl and a 2 year old girl.They all have multiple food allergies the 2 year old is nonverbal and is more on the level of a one year old( like she still gets rocked to sleep during naptime and bottles).So anyways what do y'all think Is a good amount per an hour I do 20 hours a week. I don't do laundry I will just switch the clothes from the washer to the dryer and will put towels in the linen closet and clean toddlers bottles pacifiers toys and playpen.Also I live in Houston in the suburbs because that does matter.:)