We have a dinning room at the front of the house and a lounge at the back. We've just had a new room built on and currently it's know as 'the new room' because I can't decide what to call it. It's linked to the lounge via doors that fold back and to the kitchen via a small archway. I'm thinking it'll probably be known as the family room as that's where the tv will be and where the children will play.
Growing up we has a lounge and a front room. The lounge was a lounge/dinner although was a really big room so you didn't notice the table in there. The front room was a more formal lounge which we weren't allowed in really. Then as we got older the dinning table got moved to the front room and so it started being called the dinning room lol
my grandmother's house has a "new room" that is at least 35 years old lol!
I call it the living room, my oh says lounge