I need a simple web page to allow family members from 1 family to individually log in and see their own progress in a diet. The first time they will log in and enter their starting weight and the date of that weight. Then, each week they will be expected to log in and enter their current weight. Individual weights will be kept confidential from other family members. Each week, an email will go out to remind each member to log in and enter wieght. Also each week on a certain day, a report will go out stating the progress, in terms of percentage gained/lost based on starting weight and current weight. The percentage will be public info and for each member, will be shown on the email for all to see the progress of each. It might be nice too to have a space for "words of encouragement" that each can write in briefly to share with one another. If you have any suggestions of layouts, graphs, etc, that might be nice to add, please feel free to suggest. The length of the diet is 6-12 months, and it might be nice to look in to see the progress during the term.
Please provide an example of how the site would work or How you would design it to work? I am open to ideas.