Hi!
Thanks for this opportunity. In my design, I tried to follow all your needs according to design brief and message board.
For all floors, I used contemporary approach on my designs.
Groundfloor: I designed Kitchen as your wife asked with island. Across the kitchen, I placed dining table which is like the best place for it. Between kitchen and dining room, there is a table where you can have food with small groups. I placed children play area next to living room where you can see them around easily.
Firstfloor: I enlarged your bedroom to create master bedroom. All other bedrooms and bathrooms also have the best layout and suitable design.
Basement: As you asked, I tried to design layout to have more bedrooms for your big family.
I couldn't upload my sketchup files because they are too heavy. If you could send me an e-mail, I can send you all.
Also for the time problem, I couldn't do as I imagined, so in case of any revisions, I am ready to help about it.