Two very young cats (siblings) moved into my yard and the surrounding properties. They first appeared when they were about 3-4 months old(?) and they're probably 5-6 months old now. I would like to take them in. They appear healthy and active; unfortunately, they do not appear to be socialized — at least they will not let me near them (yet). I don't know if their parents were feral, but I know kittens born to feral cats can be socialized at an early age.
I started feeding them about a week ago. They still run off when I go outside, but they're returning within minutes now that I leave them food on a regular basis. I put their bowls near a large sliding glass door leading into our living room, so they're becoming more accustomed to seeing me moving about the house. They're starting to sit near the door in the evening waiting for dinner, but when I approach the door, they run off.
How should I proceed? Are there any techniques to help them get used to me and (hopefully) more socialized? Is there anything else I can do?
We've become quite fond of them, and I want to give them every chance.
Update, one of the cats cautiously approached me as I was setting out their food today. I held my hand out and she rubbed on it and eventually let me pet her a bit. She was a bit apprehensive but I sat calm and quiet and she started to purr and vocalize a bit. The other cat is still much more skittish.