The trio are points, probably black points, called for seal points.
What look alikes they are, we cant know as yet, they are too young.
Pic of the blackie isnt really visible. We only see his face isnt the quite common teddy bear. And probably will be shorthair. Its too early here too to say much more definite answers.
Are they siblings, littermates?
If so, my guess will be, one parent may be a siamese - surely a point, but may be a siamese-look alike, and the other a black carrying cat, non point, but carrying the point gene.