I have lots of experience with barn kitties, inside cats, and feral kitties. If they are gone, they're gone. There's no catching and taming 10 week old feral cats. Sorry. You're better off catching the mother and spaying her. If you have outdoor kittens again, start messing with them from the start so they'll be adoptable. There's a window of opportunity with kittens and that's in the first 8 weeks, the younger the better. Feral cats might eat from your porch but they'd sooner scratch you up than get pet. (There's always exceptions just before anyone tells me I'm wrong and so and so's best friend tamed a 10 year old feral cat). I'm not trying to be mean, just don't want you to stress yourself.