A Product Family is a set of products that work together to deliver business value to customers. Often described as a system-of-systems, a Product Family is typically delivered by a programme using multiple teams in parallel integrating their work regularly or continuously.
Integration Scenarios are used to describe and test usage scenarios across several products that need to work together. At a programme level Solution Architecture is used to describe the elaboration of Integration Scenarios and explain the structure and behavior of a Product Family.
Product Families may also be useful from a marketing point of view and so often share common branding, user interface and architectural elements.