Build your ability to spot a good deal quickly, and to estimate repair costs, so that you can make a decision quickly if the right deal pops up.

I buy triplexes and fourplexes because of the cash flow and the ability to get concentional 30 year fixed rate mortgages.

With that said you have to ability to acquire more rental properties and feed the system you have created with your PM.

Buyer must represent "financial ability to perform" (if not contingent on sale of home, etc.).  

That will put up a guard to keep your personal things out of any legalities done on your business and which is the way to go on forming a business,  Another thing you ought to get any financing so you can include in your offers,  That should make the seller more comfortable with you and your ability to close.  

Let the seller know you are a buyer and that you do not circumvent contracts (to do so is known as Tortious Interference and it is illegal) that the agent can facilitate the transaction and as a professional he has listed the property to help you get to the settlement table, use state and local forms and disclosures and will screen you from rip-off artist and dishonest wholesales from taking advantage of you.

(FYI: you have your whole plan rely on your mom's ability to make 60 rent payments to her Child and then be able to get a mortgage that she can not right now)There is no reason for you to accelerate the principal payments, if you are renting to her, you will need to keep a reserve for maintenance problems or capital expenditures.Why not get a place and rent it out to someone who is NOT your mom and see how that goes.

Does me living there affect our ability to deduct legitimate rental expenses? 

I am questioning whether or not I should use my ability to finance up to 10 properties per FNMA guidelines just because I can.

What can you use to be best of your ability.