They are 3 adults, early 60's, employed, 2 sisters and one sister's husband who looks like ZZ Top ... the house is actually too small for growing weed inside, but has a huge yard but totally exposed on a corner lot, so i dont think that would work.

Don't they have family members (parents, brothers, sisters, relatives) that they can move into? 

My wife shared a room with her 3 sisters while her parents took the other room.

All, I bought a duplex with my sis-in-law in 2004 I lived there till 2009. It is a 3BR and 2BR. I own the 3 (59% of built up space) and my SiL owns 2 (41%). From day 1 we paid everything based on this % of ownershi...

They could all use quite a bit of rehab work and are currently being rented for 25%-35% below market rental rates due to the condition they are in. 1) Single Family - 2bd/1baGross Cash Flow = $3,000/moCurrent Market Value: $1.1M2) Single Family - 2bd/1baGross Cash Flow = $2,700/moCurrent Market Value: $1.1M3) Single Family - 4bd/2 full bath + 2 half bathGross Cash Flow = $0 (Vacant, house need a LOT of work)Current Market Value: $1.84) Duplex - (2) 2bd/1baGross Cash Flow = $4,500/moCurrent Market Value: $1.8M5) Commercial - 6unitsGross Cash Flow = $11,100/moCurrent Market Value: $2.5MTotal Gross Cash Flow Across 5 Properties: $21,300/monthApproximate Net Cash Flow (after PITI) = ~$14,000/month (property tax assessment is EXTREMELY low because it was inherited, total tax assessment for all 5 properties is <$2k/month)Market:Location: San Mateo, CaliforniaNeighborhood: Grade B+In a perfect world I would like to double or even triple this net cash flow so that myself along with my sisters family can retire early. 

I will be using financing and partnering with my sister.

I grew up there my entire life and I personally think you might do good March & May-July but the place is a ghost town once school starts back.My parents And sister family still live there and the real estate prices are insane after the storm.  

Written on a check by his sister through a trust account.

In Sisters last March there were 16 pending this March there were 22 pending.  

Then he moved out suddenly to get  a place with his ex-wife who came around again to use him yet again to do things around their new rental house and take care of here disabled sister.