Thank you very much for your response. We decided to bring the entire family in on Saturday since the weather dropped into the twenties. They seem to be doing fine, although I don't think the parents like the kiddie pool very well. We have been cleaning it daily and have seen the cygnets going in and out. We dug a hole to place the pool in, so it is easily accessible. It will be a labor intensive situation throughout the winter, but I feel it is worth it. Thank you again for your help!