I'm sorry to hear about the deaths of the kittens. I adopted a black kitten, looks a lot like the one in the photo, two weeks ago. The person I got her from was going to take and dump all the kittens on the side of the road somewhere. I could only take one, coworker knew I had lost a cat a month ago. I had mentioned seeing a black cat in my head since losing Angel, so she brought me the black one. Her name is now Shadow and my husband is in love with her, my adult cat Princess not so much so. She needed kitten milk for 2 days and then took off on regular can food. When I took her to the vet, he checked the sore on her face. It was a fly larvae! It was twice the size of a piece of rice. Poor baby, no wonder she kept scratching the side of her head. She is now almost 7 weeks old, happy and healthy and very active, explores anything she can climb into. Last night she climbed into a cabinet while my husband was feeding his birds. She then took a long nap while we tore up the room looking for her. Little fart scared him to death. Anyway, sorry to hear about the losses and I hope the survivor finds a good loving home. You did the right thing by trying to save them, but you can only do so much.
The cat in the background, giving the if looks could kill look, is Garfield my mom's cat. He didn't like the visitor at all.