Okay, going back to my friend a bit (who I'll call back today), I appreciate the input. I think you guys though just have a bit too much money (as do I) to relate to what they're trying. IF they go to Disney, they'll really be stretching it to get the base tickets. They aren't considering the hoppers or waterparks, so they can't "not do those and do Uni instead".
And unfortunately, they seem to really think they have to do KSC and Sea World. If they have to do those, then Disney becomes almost impossible because it's such a huge chunk of money. With 6 people, you can't do a vacation "cheap". Trust me - I've looked at trying it with 5. Air will run them $1200+ (yes, I know they might have been able to get SW cheaper at some point, but they didn't), Disney base tickets close to $1300, and around $1400 for the house. They need a minivan just to fit the kids, and the cheapest I'm finding for that is around $800. So you're nearly at $5000, and they haven't eaten, bought a single souvenir, or added in the KSC or the Sea World yet. If you know a cheaper way to do it (at this point!), let us know.
Oh, and KSC includes a second day for free (as does Sea World), so that's why they were considering the extra days at those. Janet - the price only goes up a lot if you're buying non-expiring. Otherwise, the tickets are pretty much around an extra $2-3 a day per person for all those days.