Using this helpful packing list, you should be able to ensure your family at least has the basics covered when packing for a Disney Cruise.
Disney Trip Planning Tips
Here is an awesome infographic that lays out the basics of Disney trip planning. It explores the pros/cons of off-property versus on for hotels; dining options and offers some helpful planning tips.
A complete list of Walt Disney World park hours and schedules and resources that will help you understand all of your park options.