@Dean Klein,please go to the nearest police station and if they like to talk, check what security firm has best relation with them and the activity in the area surrounding your target block.i think ADT will lock you into a 3 years contract, but they are a few other alternatives, wireless based, which you can move/install yourself. sorry my mind is gone today so no link/name.go to the local church on Sunday or check with the most involved neighbor on the block.maybe they are initiatives on the way like installing a city/semi-private camera  or neighborhood watch committee.maybe check with local police/firestation, maybe a recent rookie/hire needs a place.but on the lines of what @Al Williamson, said you are not a slumlord,you are offering nice affordable housing in a working neighborhood. so show that you belong there, be respectful, and walk with no fear and with a purpose.

They have a very high scenes of entitlement and believe they live in a nanny state.

Don't forget to inquire what safety measures the property has, including a watchman, double door lock or a CCTV camera. 

Guess I need to get my camera adjusted.

None of her neighbors have seen her (I believe this has much do to with the fact she stole the wallet of #5 and she was caught on camera using #5 credit card on camera)I've tried to contact her and her mobile phone is no longer in service.

You could go the unlocked route if you wanted to swap that idea for a CCTV camera as well if you think it would be an issue, but I am not sure what level of concern you have. 

Have on hand a tape measure, disinfectant wipes, camera, pens, small tool box, first aid kit.6.

When you go back, bring someone with you and a camera.

In any case there is a market not just for parents but live in caregivers for older people or nanny's.   

However, the tenant wrote a long email explaining the cousin is just there as nanny to her young daughter and his family is just there for a visit.