THey look like a Britsh black long hair, which would explain their size their frame is most likely Bombay, So a Britsh short/long furred Black bombays. (By the way I own one as well.)
If you are helping out give them distance and put food near the entrance, then they should begin getting used to you and if you can get some 'good catnip that is reccomended such as willows catnip. It should help the mother with the stress and sometimes the kittens if a storm is in your area try...
That may be a issue depending on the cat. Most eye colour changes will be to do with their mood. You can tell as if you play with them their eyes may change like my cats eyes change yellow and when shes relaxed they turn green but if they change yellow and orange it can be a sign of eye issues.