The one who stays on the porch, KT, is becoming friendly. I still don't know if it is a boy or girl, but it will now rub against my legs and let me touch him/her to scratch its head. I have even picked it up briefly.
It probably helps that we set canned food out twice a day for these little black fuzz-balls. Hopefully, soon I will entice KT into the house and then I can see about getting medical care done.
My dogs, Satchmo and Austen, both seem oblivious to these cats unless they start darting around. Then they want to go play with them.