My daughter is going back to part-time education as a mature student. She wants to stay in a rental apartment that I own. As she is still employed part-time, she will be paying me a very low rent. Is she considered to be a tenant and do I have to register the tenancy with the RTB? I'm worried that I will be setting the rent level very low for the future and that I won't be able to return to a market rent when her course is over and she moves out.