My folks once convinced the next door neighbors' cat to adopt us. Just constantly visiting, and it was separated by some woods. my mom started to feed it, and eventually let it inside. All was good for a year or so until one the neighbors were walking by and talking to me and my Dad, and he said "hey Chickenfeathers" to the cat we had been calling "Rover" (we named it that because Fido would have been a dog's name). We get talking, and the neighbor had just assumed Chickenfeathers was out wandering and living outside. i don't know if it was an outside cat to begin with. Rover had a brother with the neighbors and I think they had a 3d cat, too, so the neighbors were cool with the cat being taken care of by us, and of course Rover would visit them and hang out with its brother.