Hello Kelvin!  Wow!  Seven days at the Walt Disney World Resort is going to be such a blast!  You and your family must be so excited!  I know I am excited for you!  Well, your question can be subject to many different opinions, but I will try my best to give you mine.  With seven days, you will be able to tackle all four parks with no problems at all.  I always love to begin our vacation with the park that started it all.  The Magic Kingdom really is a great way to just jump right into the magic of Disney.  The rides and shows will keep every member of your family happy!  This is a park that will require 2 days, so you can go back the next day or come back after you have visited the other 3.  Next, would have to be Hollywood Studios.  For the young ones, you have Playhouse Disney and some other great shows.  The teens will love the rides that this park has to offer.  Don't forget to end your evening with Fantasmic!  I would then visit Disney's Animal Kingdom and then Epcot.  Once you have experienced all 4 parks, you and your family will have an idea of how and where you would like to spend your remaining two days.  Trust me, your kids will let you know.  Trust me!