MPs have sought clarity over whether households comprising parents and a disabled adult on disability benefits will be exempt from the £500-a-week benefit cap due in next year.The Government is capping the total benefits households can receive from next April at around £26,000 a year to ensure work always pays. It has stressed there will be exemptions including those households in receipt of Disability Living Allowance (DLA).However, clarity was sought from Labour MPs yesterday follo...