What should my pay rate be?

Mo
I currently nanny for 2 children for the past 2 years and mom is pregnant with #3!! 
I get paid 15$ right now(before tax 😢) and I do everything around the house. Laundry, dishes, groceries, cooking, sweeping, dusting, disinfecting, organizing etc 
The parents want me to help out with the newborn when he/she arrives (obviously they're a lot of work!!) 
But none of us have done this before so they aren't sure what to pay me now and asked me what I thought would be fair. 
I was thinking 20$ because 3 kids and a house is a lot of work and while the 2 older ones are easy who knows how their behavior will be when the baby arrives and a newborn needs a lot of TLC. I looked online and people and websites were saying 16$ but that is NOT enough in my opinion. 
What would you be willing to pay/ think is fair for all that work? 
Also the parents both make 6 figures so this is a luxury they can certainly afford. 

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