Remove the door knockers. Pull down the shutters. Pretend no one’s home. Your adult children are coming back — for good.

One-in-nine baby boomer parents said their adult children returned home within the last year, according to a new report from financial services firm Fidelity Investments and Stanford Center on Longevity, which surveyed 9,000 employees.The adult children save money on rent and household goods, but their parents are the ones who appear to be suffering: 68% said they were more stressed, 53% said they were less happy and another 53% said they had less leisure time after the return of their “boomerang kids.” More than three-quarters (76%) said they took on higher expenses, too.