One of my first questions would be to ask the age of
your daughters? Some breeds are more docile than
others. More "child friendly" if that be the term.
And hens more so than the rooster as a rule.
As fun as chickens are --and they are fun-- know that
not all chickens are good with children. Not a chicken
out there worth getting a child hurt. (Had a few roos that
would mean to tear you up.)
That being said, chickens can make great pets. My girl has
been around chickens since she was about three.
Oh...I like about 10-12 at least. That depends on your coop,
the yard. But a nice small flock, 10-12.
You have your coop ready? How big is it? Chickens make great
4-H projects if your girls are interested.