G’Day from down under
acmyst.. 
Welcome and Congratulations!
Your babies are adorable!

If you post some pictures of the black one on the
Breed or Gender Forum folks there should be able to help you identify.
How old are they? Have you prepared yourself for the fact that they may not be girls? I do not want to be an alarmist, but that is a lot of red comb on one so young; but hey, too soon to tell yet.
I do hope you enjoy being a BYC member. There are lots of friendly and very helpful folks here so not only is it overflowing with useful information it is also a great place to make friends and have some fun.
Including your general location on your profile will assist others. Location, climate, season etc can be important factors when members are responding to any questions you may have and vice versa.
You might want to also
Find Your State Thread and pop in and say hello.
BYC has a
Learning Centre and also
Topic of the Week discussions which I have found to be a great resource, informative and sometimes entertaining; so definitely worth checking out. Also, there is an active
Silkie Thread.
If you would like to share more
Pictures and Stories of your flock, you have come to the right place. BYC’ers never tire of these and do not back away slowly or commence eye rolling when the photo album or home videos come out