I would suggest either a condo or a vacation home for a family your size. Sheraton's Vistana Village is offering the seventh night free for their two bedroom, which is large enough to accommodate you all. I just got back yesterday from renting a vacation home which was WAY too large for me, my 8yo son and my sister, but we loved having the separate living quarters. All three of us could stretch out in different areas without any problem, which I see, as my son gets older, very important!
There are lots of suites in Orlando for a larger family, but most are too small for multiple adults IMHO.
Hope that helps!