LOL! You've got a whole rainbow there! Yeah, we lived close to a farm when I was growing up, and people were forever dropping off cats - including pregnant mothers or mothers with tiny babies. Just burns me up that people would do such a thing...we adopted quite a few over the years, but I think our highest count was maybe eight or nine.
I'm still trying things, but getting frustrated. Cleo in particular worries me.
We get the occassional pregnant cat or momma with young kittens in tow, too. It's disgusting that people won't take responsibility for their pets and have a little surgery done. All our Kidz are spayed/neutered except for five kittens who were born two weeks after their mother arrived. They're almost old enough, though, and will be scheduled for surgery soon.
We keep our vet busy. LOL!
I sincerely wish you all the best of luck in finding good homes for your girls. They're gorgeous cats and I'd think they'd be relatively easy to place. Unless there's simply no one looking for a new cat to take part in their lives.
It's sad you can't take them with you.