There can be lots of questions around how CCS works and how families qualify. The link here Child Care Subsidy – Services Australia will provide all the intricacies for you, and there is a handy calculator that can give you an indication on how it might work for you and your family.
NB: This used to be called Childcare Rebate and Child Care Benefit (CCR and CCB), but these 2 x systems stopped in July 2018 and have been rolled into one system now, called CCS.