We add investors – like any other investment firm - to share profits and grow with – just like Charles Schawb, Morgan Stanley, JP Morgan, or Fisher Investments who also advertise.

As our family grows she will cut down to part time so my thinking is (correct me if I'm wrong) that banks will not lend as much to her as they will to me.  

All of these companies (and several others like The Michaels Organization, NFI, American Water, Lockheed) already existed in the south jersey area...so there isn't any new job growth causing for Oaklyn/Bellmawr to grow any more than they already were.

I have one 4-room house for students in a smaller, Southern public university market (heavily commuter, growing its out-of-county population) and I don't quite understand the timing of this particular area. 

Stay put and grow your savings through non real estate investments3.

I would continue to buy more duplexes and continue growing, and learning and then maybe you can sell all and jump into something larger.

@Akeem Wheatley The subject has been beat to death on BP.https://www.biggerpockets.com/forums/519/topics/24...It boils down to this...If you can put your money into an asset growing at 6-8% and you can get an immediate line of credit against that asset at 4.5% (prime), then anything you can do with that borrowed money that earns more than 4.5% will be adding value on top of the original asset.

Mindful of the fact that I'd like a way to generate income to reinvest and grow and I don't know anything about buying and selling REO, notes, tax-liens, and all the other seemingly 'quick-turn profit niches out there , is Multi-Family smart to start with?

It's an ordinary lease for a shorter period of time.

Just keep in mind, flipping produces ordinary income which is taxed based on your tax bracket.