It depends on your state laws.

Housing authority hasn't been able to reach the mother (who is the only one on the voucher) and when they spoke with the daughter, she stated that she doesn't handle her mother's affairs anymore.

Texas is the greatest state for property tax sales.  

To state that a broker cost more than a lender is false and can vary based on institution.

Should I register it here or in the State in that I will be investing?

Some other areas may attract influx of residents from other states who find triplex on very small lots attractive. where do I find that data?

Not sure in your state but would assume its the same.  

Whereas a bandit sign will typically be vaguer and suggest “we buy houses,” personal property signs will state the home is for sale.

I'd cash flow immediately without having to pay for a PM to place tenants ( I am out of state). 

We are seeing its very challenging, especially for out of state owners.