Are chemical engineering and biochemistry their own disciplines?

Chemistry provides the foundations for both chemical engineering and biochemistry. Once perhaps sister-disciplines, these academic communities now often seem more like distant cousins. Over time they have developed closer ties to the engineering and biosciences communities respectively, creating very separate academic cultures. So what does chemistry share with these disciplines today, and how do they view their chemistry colleagues? With an increasing emphasis on multidisciplinary research and innovation, is it time for a family reunion?