But, my question is, if I have multiple family members loaning the company money, how could I get it so they all hold second position on the house?

In this seller's market, if there are multiple offers, a 203k loan will not be as strong as a conventional loan.  2.

I read them multiple times.

Does this mean that they actually own each of these 1100 units themselves, or does this mean that they are involved in multiple deals, where the total 1100 units are actually owned across *all partners* within these deals(thus exaggerating the true ownership of the individual)? 

If you open another credit card with a high limit or distribute you debt across multiple cards your credit score goes up.

You could qualify for a good size loan and/or multiple mortgages for multiple properties, this assumes you don't have car and student loans and other bad debts. 

He has multiple rentals in this area.

There are multiple strategies that can work to make single-family homes house hack for great returns right out of the gate (rent by the room, split level turned duplex, short-term rentals etc.)

I've been actively looking for 4-plex properties here in DFW and have run across multiple sellers asking buyers to sign appraisal waivers.

I'm open to buying multiple properties if the numbers make sense.