Thanks!
I wasn't sure if no more would appear while one was sitting there. Although I did have a strange thing earlier. I put one of my children on a rock but she was one of those annoying villgers who doesn't like running do she started to plod away really slowly. But then, almost immediately, the same coloured rock appeared from where she had picked it up. I put another child on it and he picked it up but the one the girl was carrying vanished!

I don't really mind waiting - it gives me something to do while I wait for my plants in Plant Tycoon to grow.