"they are con artists and manipulators"
I agree. I'd like to add that they are lazy too, IMO. They will sit back and let you do EVERYTHING. I think that is one of the worst things about living with these people. They will sit back while you work your fingers to the bone, have no rest, no enjoyment out of life, and they have no qualms about even being nasty to you and making life harder on you than it already is. They are often freeloaders who do not care about the person they are using. They are like parasites. This stuff really frustrates me.