Empty-nest baby boomers won't give up their large homes — and it's hurting millennials with kids

• Baby boomers now own twice as many large homes as millennials with kids, Redfin reported. 
• Boomers don't have much financial incentive to downsize as millennials struggle to buy. 
• Land-use, tax, and other policies need to change, and many more homes need to be built, experts say.

Baby boomers whose kids don't live with them anymore are clinging to their large homes, making things worse for millennial families looking to settle down, according to a new Redfin analysis.