sorry, for this case, it is not 一家一主
It is because her 99 is helping her to take care of her kid everyday!!!!!
If it is 一家一主, then her 99 don't need to take care of her kid!
Don't angry anymore!
You don't need to tell what you are doing tomorrow. However, you should tell your 99 that you don't need her to take care your kid tomorrow.