Micki76 is absolutely right - do not touch them!!!If you do, the mother may abandoned them and then you'll have 4 orphaned kittens on your hands.

Are their eyes open yet? If not, then they're probably about 2 weeks old. These kittens and the mother are feral (wild). In order to socialize them easily, they need to be taken from their mother before they are 4 weeks old. Otherwise it gets more difficult. If you can find them in the same spot like you just did, in the dog house all huddled together, just put them in a box and take them inside. By 4 weeks, they should be able to start eating canned kitten food mixed with KMR (a milk replacement).

If I were near you, I'd be more than happy to help you out.