Originally Posted by D

No problem, man - happy to help where I can.

If it is the case that they're clean and well fed, best thing you can do is leave them be - and interfere as little as possible - they'll likely move on in a few days. Getting too close to the nest or touching the kittens (unless you're prepared to bring them in) could very well affect the situation adversely... depending on how tame (or not) the mother is.