Conservative two or three button American cut dark grey suit.

Ive got my eyes on a 120k fourplex in my area with a fairly decent cash flow. However the specifics of the deal aren't the important part of my question.I'm 18 years old and this will be my first property if I'm able ...

It just may be risker to move all your investments into a new state or area that may have a minimal return.

I am completely debt free and have minimal expenses due to my girlfriend and I budgeting and being very thoughtful on what we spend our money on!

Also, you put $0 for repairs, I'd expect to have at least some minimal expenses right away to be safe. 

Plan to purchase duplex with my money as down payment, family member to bring sweat equity and rehab the units.
I would like to maximize tax advantages.  Would there be a problem if family “partner” is staying in a u...

That is the problem with minimally-funded policies.

For a couple thousand bucks you could make this place look pretty nice: clean the mold/mildew or whatever the black stuff is under the eaves and on the base of the front porch post, touch up the paint, get rid of the mismatched cabinets with missing drawers, the faux brick, the wood paneling, the beat up and dirty dark flooring and replace all that with updated but inexpensive builder-grade materials, put a real handrail on the front porch instead of the ugly 2x6...

It sounds like it's either on autopilot now or you could spend minimal time on it for a little bit and not get hurt.   

I put up some cheap temporary handrails to pass final inspection, but I need handrail ideas 3) The original stain on the stairs was a dark brown... combined with the sheetrock texture all over it.. this is a sanding nightmareHELP!!