When both my Kids were still living at home, as well as my Nephew and My Father were all living here...My Basement was set up with 2 more Bedrooms, a full bathroom, a living room and the Original entire Kitchen from before the upgrade to new cabinets, sink, etc.
(so it was a full working downstairs kitchen).
My Father has since Passed, my nephew finished college and is married, both kids are moved out and on their own, So...
My Basement now has a Full Wet Bar, Living Area with Entertainment area, Pool Table, Seperate laundry Room, Utility room with work bench, Full Bathroom (the Man Bathroom), and Storage Room.
Great Spot for family Get togethers. Most of the time the Ladies stay upstairs and chat in the dining room while all the guys hang out downstairs by the bar and/or play pool!
I grew up with a basement, and would have a hard time living with-out one.