Probably more profitable!

If you buy it, you're not a wholesaler anymore.Here's how you do it:1 - Make the offer in the name of an LLC for $10k, thus the LLC is the owner of the "contract"2 - Sell the LLC ONLY (with the contract to buy as an asset of that LLC) for $15k (the profit you would have made if you had to buy the property first)3 - Buyer of the LLC (and the contract agreement/asset) executes the "contract" your LLC agreed to for $10kResult:1 - No money comes out of your pocket...ever. 

However if you're positive this area is doing well and it doesn't have:Population decline or stagnationCompanies leaving the area with none taking its placeDeclining average incomeRising average age of populationRising tax delinquencies or foreclosures I would only take the leap if you understand these and there are still risks such as the aging property which might have a lot of deferred CapEx work which will eat up profits if not forecasted and budgeted correctly. 

Congrats, @Jordan Moorhead - that profit will help you get into some more properties!

I was wondering if seller financing could be a way to give my brother a better price and my mother more profit.  

There are a lot of people like @Paul Sandhu mentioned, making calls to owners and agents to lease and re-lease or sublease these properties, and there are management companies as well that can assist with furnishing, eys and turning it over for cleaning between stays. but again I think that owning the building, make this model more obtainable and profitable. 

To make it work with a decent profit would require a significant counter.  

Sure as time goes on you may develop a basic understanding of Facebook ads, but if you have an advertiser implementing things you aren't used to or haven't heard of, you might not know if he is actually doing things correctly.Ultimately everything needs to come down to profit.

My main focus is just wondering which might make more profit on the short and long term you know as In monthly income and Also over all winnings .

At the end of escrow, I will get close to 300K but out of which $15 to 20K is the profit.