Board/Rent – Do I have to pay tax?

I've built a house in hillcrest that is a little unique.  My side of the house is a 3 bedroom 1 bathroom, and then I have the laundry that has a door on both sides of it, and as you step through the laundry, you walk into a 2 bedroom 1 bathroom little unit with a 'kitchen' of it's own. It's a shneaky idea because essentially my house is really just a 5 bedroom house with a kitchen and a 'wet bar', but the moment I lock the laundry door, I can completely separate the two sections. It's wonderfully sound proofed all the way through aswell so I don't hear a thing.

I have 'rented' out the 2 bedrooms on the one side of my house for $300 p/w. They are technically living under the same roof as me, though it doesn't feel like it. What's the tax situation with this idea? Do I need to declare what they pay to live there?

To go a little deeper, on my side, I have rented out one bedroom to my brothers, wives, brother. Essentially, he pays board as the price includes food costs. We shop and cook for him aswell.

Do I have to pay tax on any of this? Does it count as income, or does board not count?

All three tenants (2 in the unit, one in my side) have put on their dole forms that they pay a certain amount of rent to me each week.

I just want to make sure I'm being smart, but legal at the same time.