May I make a suggestion? Why don't you do a one night stay at one of the Universal Resorts? That will give each member of your family an unlimited Express Pass, plus entry to WWOHP an hour before the general public. The room itself would be much cheaper than GF, so you're practically MAKING money on the Express Pass

Also, its good for the day you check in and the day you check out, so that's two full days of no waiting in lines!
They are opening a new family suites hotel at Universal, but I beleive that will NOT include the Express Pass, just early entry to WWOHP.
The new Diagon Alley section will be opening in the summer of 2014, and they expect the parks to be extremely busier, so staying onsite might make sense for your family.
We are getting married October 11th, heading to Orlando on the 14th. And I always said I wanted to honeymoon in Disney..my friend told me if I could find a guy to agree to that, I'd BETTER marry him haha. My DFi had never been to Disney before our trip this year, and he loved it so much that HE actually suggested it for our honeymoon

We look forward to bringing our children there someday. One of my favorite parts of this trip was seeing all the excited kids, and talking to some of them in line (I was also talking to the parents-nothing creepy going on!haha)