Both units are identical: they are each 3b1b, 1,035 sqft, and single car garage with street parking.Currently I have 3 groups of tenants who I'd like to rent to but cannot decide who are the best 2 out of 3:1. 

Ontario Human Rights Code:People cannot be refused an apartment, harassed by a housing provider or other tenants, or otherwise treated unfairly because of one or more of the following Ontario Human Rights Code grounds: race, colour or ethnic backgroundreligious beliefs or practicesancestry, including individuals of Aboriginal descentplace of origincitizenship, including refugee statussex (including pregnancy and gender identity)family statusmarital status, including those with a same-sex partnerdisabilitysexual orientationage, including individuals who are 16 or 17 years old and no longerliving with their parentsreceipt of public assistance.

I have two single family homes identical to each other same model same year built.

Sue K. is right on the money as she hints at finding your own investor identity before you find a particular neighborhood.

One reason I'd possible identity fraud on his part.

Since you guys pretty much don't have a leg to stand on to say no, at least this way you can get a little extra rent and can formally add the minor to the lease (no recourse there but still prudent to have all residents listed) and can ask for some proof of identity and age (possibly some kind of school ID or birth certificate since she won't have a license yet).  

Great idea, but uploading an image of my drivers license is an invitation of identity thief.

If you don't want me to reveal your identity, I can do that too.  

When I asked her about it, she said it was an identity theft issue, and that she had never lived anywhere other than her home since 2000.

But, you can require proof of their identity and financial status, etc.