Can we see the whole kitten? It could be fever coat, or unsound coat. Theoretically could be low grade smoke/silver, but not super likely if none of the siblings have evidence of inhibitor gene, especially given roots aren’t white, and they’re just lighter, which is more indicative of unsound coat.
Hard to tell without context of the whole kitten. What colour is mum? Any clue what dad looks like?
These 2 are littermates. I swear pic 1 and 2 was straight black and white but she too has different colour roots and now looks more brown pic 3 is the one who is very similar to the kitten in first post
If these are the same kittens as you have here Young Pregnant stray they’re all just black based, likely unsound black or fever coat. You have black solids (with ghosting) and black tabbies, both with white
They’re likely black/black tabbies, regardless, though
Just looks like unsound kitten coats, expected for their age.
Have you got photos of Mum at full length and in good lighting? While some genes are recessive, Mum will give some good clues as to the possibilities.
As above they currently look all black based.