There is no reason to not take advantage of lower rates and down payment. 

It opened my eyes to the amazing tax advantages of real estate that i wasn't aware of.

There are some advantages to this strategy but it is also very risky. 

I score people on a "whole person" review in three broad categories: proof of identity, how much they make, how well they pay their bills.If they are so young they don't have credit or a Landlord reference, then they are high risk.

As you grow and get into bigger deals you'll be forced into ARMs so take advantage of the long-term loan while you can - just my two cents.Also, I'd talk to more lenders and see if you can find lower rates and maybe someone who will go up to 80% LTV on the 30 yr fixed refi. 

I do not want to take advantage of them but want to help them as well as help myself at the same time.Any thoughts to how I can work this where it will fairly benefit both parties involved with low risk for myself?

By starting with a primary you can also take advantage of lower interest rates and lower down payment programs.

You have the advantage of having your brother there and there is nearly an unlimited amount of information available online. 

Our predecessors took too much advantage of that rule and “screwed” us. 

It’ll be my very first RE investment so I am unfortunately in the stupid, new, naive, and excited category.