A realtor holds an open house in Somerville, MA.

It might seem obvious, even simplistic. But having home equity and retirement accounts are key to most families' financial assets and — by extension — retirement security.

According to new research from the nonpartisan Employee Benefit Research Institute (EBRI), home equity and retirement accounts — 401(k)-type plans and IRAs — account for nearly all the assets that many families have to depend on in retirement outside of Social Security and traditional pension plans.