The Day Nurseries Act requires that any premise be licensed that receives more than five children under the age of 10 years, not of common parentage (children who have different parents), for temporary care and guidance.

An individual may provide informal child care to five children or less under the age of 10 years who are not of common parentage (children who have different parents), in addition to his/her own children, without a licence.
I have two boys of my own, both under the age of 6.
I can have a total of 7 children if:
5 are 5yrs and under, and 2 are between 6yr and 10 year, and 2 are mine.
My son: 3 1/2 yrs (counts as under 5)
my son: 1 yr (counts as under 5)
dck #1: 3yrs (counts as under 5)
dck #2: 20 months (counts as under 5)
dck #3: 9 yrs (counts as over 5 yrs)

so i can have one more dck under 5 years and one more over 5 years.

Different parents as in NOT your children.

I am with two agencies and they had to explain it all to me more then once before I understood.