Agree. I want to add, Mom´s overall look could otherwise pass for a Russian blue, surely of pet quality, but still, there is a RB-ish look in her.The "breed" is a Domestic Short Hair(DSH.)
As for colorings, Mom is a "diluted" tortie,baby #1 is a tortie (female,) baby #2 is black, baby #3 looks like maybe a black tabby.