It look like in Alberta you can have 6.

I found this. http://humanservices.alberta.ca/fami...day-homes.html

It say that :

"In Alberta, a family day home must be approved by a contracted family day home agency and abide by the provincial Family Day Home Standards. These programs offer you the option of choosing quality child care that is provided in a home-setting. These child care providers are recruited, trained and monitored by a contracted family day home agency to help ensure the safety and well-being of each child. Child care providers that operate an approved family day home program can care for a maximum of six children, including their own.

People who offer child care out of their homes, that have not been approved to operate under the provincial family day home category, are considered private babysitters. These programs can offer private babysitting to up to six children, not including their own, at any given time. These programs are not monitored to help ensure the safety and well-being of the children."