The government’s proposed benefit cap will apply to carers looking after their disabled offspring, forcing some parents to move out of their home or put their child into care, it has been confirmed.

Ministers have repeatedly said disabled people will be exempt from the £500-a-week benefit cap that is due to come into force in April.

But they have now accepted that if a parent is still looking after a disabled child after they reach adulthood, even if the child’s mental age is as low as eight, the parent and the child will be treated separately, and the parent will be subject to the benefits cap.

In the Commons last week the work and pensions minister Esther McVey said: “In practice most carers will be exempt [from the cap] because their partner or child is in receipt of disability living allowance.”