My wife and I have done a number of US west coast cruises. Thay usually are reposition at the begining and the end of Alaska season. We found the prices to be good.
As for children and nursing homes we have not had that problem at all. The cruises can range from 2 days to 6 days. RCCL, Princess and HAL seem the most popular, sometimes Celebrity.
Try posting on cruise bargins here at CruiseMates, give as much information as possible. Your e-mail and other pertinate personal information is is not sent with your request.