Could someone give me some advice on feral kitten care?

Try to move them into a cat carrier. Where gloves just to be safe. Take them to your local vet for a check-up. If you are going to keep them, ask your doctor if they have anything that you need to be concerned with. If everything is ok, then when you take them home give them their own little room to roam in. Let them get used to that first. Add a cat tree and throw an old blanket over part of it so that they can have their own little hide away. Put some little toys in there like toy mice and . If they seem used to it and try to escape to roam the rest of the house, hold onto your other cats or put them in a cat carrier in the center of a major room. Let the kittens out of the room to raom around thew rest of the house. If they do something they shouldn't spray them with just a bit of water to stop them. Keep letting them out and getting them used to the cats in the crate. After a while, put the kittens in their own crate and have your first cats get used to them. Then slowly, but surely let all of them roam the house together. If the attack each other, spray with water.