Oh I like this question!
It would be in a small town of around 500 or less people.
It would be near a lake (because my man loves to fish).
It would have enough bedrooms for each kid to have his/her own room.
There would be a greenhouse (so I could garden year round).
A big huge kitchen - because I love to cook
A big huge dining room - because there are 10 of us ( me, my man, and 8 kids)
A big huge living room - because I would love to have the space to be the house the extended families come to for the holidays.
* I know, I dream big. but you did say "dream house" and not "reality house".