Who is Rebecca Muir? Meet David Muir's Older Sister(03)

Who is Rebecca Muir? Meet David Muir's Older Sister(03)

Image Gallery: Discover: What Does David Muir's Sister Do? Revealed!

Who is Rebecca Muir? All About David Muir's Talented Sister David and Rebecca Muir Inside the relationship of the famous host and David and Rebecca Muir Wedding Is Really ABC News Anchor David Muir Who is Rebecca Muir? Meet David Muir's Older Sister