We often add a second room under the family plan. There have been a few times when I could tell that the CSR was not familiar with the option. In those circumstances, I would just hang up and call again. Most of the CSR's are very familiar with it. It is somewhat hit or miss whether a hotel offers it at all or offers it on particular dates. I have experience with some hotels that had the rate plan available on certain dates and not on others. If it is available, I think 50% off the Standard Rate is the typical pricing. While the member or other promotional rates are often a decent amount lower than the Standard Rate, the family plan rate is almost always the best deal for a second room, and often by a significant amount. Another nice option is that you can add a family plan room to a cash room or a points room. We frequently use points to book a first room, a TSU to upgrade the room to the Standard Suite, and then add a connecting family plan room for the reduced rate.