1st- under no circumstances tell the landlord you are odsp, just say you get a monthly pension. Most landlords will turn down a candidate on odsp. As long as you are able to afford your rent that's all that matters...
2nd- why are you still doing room & board? That's foolish, make a lease with your parents for the max shelter allowance , rent can increase with rate increases. Make it clear that you shop/buy/prepare your own meals, etc. in the lease. Presto, your income doubles or more!
3rd- whether you rent from family or someone else, always have a written lease (it doesn't need to be complex, 1 page or less outlining security, rent, entitlement, rules, term, date & all signatures.) that states the above statements. You can rent from the landlord or better yet the roommate & you are protected without the hell of them paying you his half of the rent!
4th- always, always get receipts! NEVER any exceptions, no matter what anyone says! If there is any changes to the written lease, make certain to memorialize in writing; send an email, registered mail, text messages, voicemails, write a note, sign & photographs, record the conversation if all else fails! BUT GET IT DOCUMENTED WITH PROOF! Email & text messages are perfect!
5th- once you have a lease, take it to odsp & have them stamp the original, photocopy & return the original! Then they should automatically adjust your income! There you go, bob's your uncle!
Good luck & stop the boarder madness with your folks & you!
Adam