A family room is an informal, all-purpose room in a house often confused with a living room. The family room is designed to be a place where family and guests gather for group recreation like talking, reading, watching TV, and other family activities. Often, the family room is located adjacent to the kitchen, and at times, flows into it with no visual breaks. A family room often has doors leading to the back yard and specific outdoor living areas such as a deck, garden, or terrace.
The term family room was introduced in the 1945 book Tomorrow's House by George Nelson and Henry Wright. Chapter 7, entitled "The Room Without a Name" spoke of the need in modern life for a new "biggest room in the house" that would serve the social and recreational needs of the entire family, allowing activities that would not be permitted in the living room.
This "big room" would have furnishings and materials that were "tough", for hard use, and it should be easy to clean. In contrast with the existing "rumpus rooms" of the time, it would occasionally serve for slightly more formal entertainment, so it should be a handsome room and should have cupboards where toys, tools, etc. could be kept out of sight. At the end of the chapter, they conclude that "we should simply call it the 'family room.'"