Democratic presidential front-runner Hillary Clinton is backing a new tax credit worth up to $1,200 and other supports for people caring for aging parents and grandparents, saying that too many Americans struggle to provide care with too little help.

She also is proposing a change in Social Security rules so that unpaid family caregivers get credit for this work toward retirement benefits. A Clinton aide said the total cost of the initiatives was estimated at $10 billion over 10 years.