Adapting real-time embedded software for various variants of an application and usage contexts is highly demanded. However, the question of how to analyze real-time properties for a family of products (rather than for a single one) has not drawn much attention from researchers. In this paper , we present a formal analysis framework to analyze a family of platform products w.r.t. real-time properties. To this end, we rst propose an extension of the widely-used feature model, called Property Feature Model (PFM), that distinguishes features and properties explicitly, so that the scope of properties restricted to features can be explicitly dened. Then we present formal behavioral models of components of a real-time scheduling unit, i.e. tasks, resources, and resource schedulers, such that all real-time scheduling units implied by a PFM are automatically composed with the components to be analyzed against the properties given by the PFM. We apply our approach to the verication of the schedulability of a family of scheduling units using the symbolic and statistical model checkers of Uppaal.