Planning a cheap trip need help

[HS3kids]

I need help planning a trip for my family plus my sister's family...We all want to stay on property....I have a family of six myself, husband,daughter 4 years old, son 14 years old, son 21 years old,and my daughter in law 21 years old....My sister family is my sister, niece 14 years old and nephew 18 years old...We would like to stay for six days....Were not looking into going to the water parks, just the theme parks....We did look at the dining package but not sure if it's worth it or not? We do want to do atleast one sit down meal a day...How can i make this trip cheap as possible? My husband and my self will be paying for our family so i want everyone to go but try to make it affordable for us...We have only been to disney once and we spent well over 5,000.00 plus spending money last trip only for four of us....We went to a travel agency last time and she added stuff in our package we never used but paid for...Help us plan our vacation cheap? Not sure what time of the year is good but looking to go at times that are least crowded...Last time we went at Christmas...I did hear the first week of Dec was nice and not to quiet not sure if that's true...Thanks any advice would help thanks..

"Cheap" is a relative term. But... if you go 12/4-12/10 (6 nights 7 days) with 7 day base passes (no park hopper or water park options) and both families stay at ASMU here is what wdw says will be the cost:

Your family (4 adults, 2 children, ages 4 & 14) ASMU family suite plus 7 day base passes, free QS dining plan (you can upgrade to the full dining plan, i *think* its $11 per adult per night extra) = $3041.12

Your sisters family (2 adults 1 child-the 18yr old is considered adult) ASMU preferred room (so you all will be somewhat close by each other) 7 day base passes, free QSDP= $1549.73

This doesnt include airfare, or gas if you're driving. Hope this helps a little

p.s. the FW Cabins are great, but almost $100 more per night. The ASMU family suites have mini fridges, microwaves and coffeemakers so you could eat at least one meal a day in your room to save money too.