Can You Rock Climb Efficiently as a Team of Four?

Because our entire family of four are climbers (to varying degrees), we have climbed as a team of four, on occasion. This is an unusual occurrence for most climbers, but for families with two kids of similar age, it happens fairly regularly. The same methods that can efficiently get a family of four up a multi-pitch route can get any other four-person team up a route when splitting the team into two twosomes is not an option.