I am not sure what DVC points are but here is a paste of another post I put on here that might help you out. Even if you are only going to Sea World, I would recommend the Disney Value Resorts for your age group...otherwise...
We have been staying at the Quality Inn on I drive and love it, very affordable. Clean and very friendly. I wanna say it's less than fifty a night. 7600 International Drive.
When we had Disney passes we would stay at the Disney value resorts because they offer so much entertainment and have fairly good food in their courts. They are usually around a 80 to 100 a night. But worth it, it's fun there. I recommend the All Star Movies but we've stayed at them all and have enjoyed them all.
As for SW...you def wanna take a stroller. You can rent one but they are pricey and uncomfortable. You are allowed to take in snacks, water, etc. Little ones need those and we learned it's much cheaper and healthier to take our own. You can also buy a refillable soda cup for about seven bucks.
Shows: Pets Ahoy is a nice show when you're hot cuz it has A/C. And it's cute. Gotta see Shamu...Believe is nice but Shamu Rocks is the bomb if you are there that late. (it's right before the park closes). Blue Horizons is a must see, absolutley beautiful. Clyde and Seamore are always cute, especially because they don't always cooperate, makes it funny. I would not recommend Allure for the kids, boring for them.
Activities: Happy Harbour is awesome for that age group. The six year old may be able to go on the Shamu roller coaster, depends on height. My seven year old twins went on it about 15 times last time, they are too short for Kraken. They also have a bounce house and other cute kiddy rides over there.
Eating: Definitely recommend Mango Joe's outside of Shamu Stadium for the price. Fajitas, chicken fingers, etc. If you wanna get a little more fancy, recommend Shark's Underwater Grill. Nice experience for first timers, just very pricey. Seafire Inn has nice burgers and salads. I do not like the Spice Mill. Dine with Shamu is pricey too, heard it was good, plan on doing that this year.
One day at SW is hard to fit everything in, esp. at that age. I'm sure the 3 year old will take a nap so def get a stroller somehow.
Have fun! I love it there and wish I could go every day. Just bought two year passes, gotta love living in Florida!
Take care,
Cheryl