Hello,  If you have a single lease, and no locks on doors then it should not be considered a rooming house. 

Most Landlords/Owners are concerned that under the new government lease, you can rent out a single family home, but cannot prevent the lease holder from allowing others persons to stay there. (the leaseholder is not allowed to charge more in total rent than the monthly rent on the lease) 

In your case, I suggest to have them all included as tenants and sign the lease.

The Government Tenancy Agreement states. "Unless otherwise agreed in the additional terms under Section 15, if there is more than one tenant, each tenant is responsible for all tenant obligations under this agreement, including the full amount of rent"

Or you could have one person be responsible for the lease, and the others listed as occupants under your additional terms. 

Please note: that this feedback has not been provided by a Lawyer, and should be not be construed in any form as Legal Advice. If you have concerns, I recommend that you consult a real-estate lawyer. 

Cheers, Mary.