They can still be pure silkies, look pure to me, sometimes they are born with 4 toes, it is very hard to breed perfect silkies and who knows how perfect the bloodlines were.
Please give them a feather duster to hang from the top of their cage, just barely dusting the floor of the cage; that will be their "mommy" and stop the lonely peeping.
I think chick #1 will be white.
Oh, and P.S. you are an angel for taking them in from the cold!!!!!!!!!