A child or qualifying young person in hospital or residential
accommodation for longer than 84 days can continue to be treated as
living with the claimant if the claimant (or their partner)
regularly incurs expenditure for that child.
Expenditure can include
Expenses incurred by one of two partners residing together can
be treated as incurred by the other if both spouses agree to it or
Her Majesty’s Revenue & Customs so decide.
A claimant need not regularly incur expenditure for a child
or qualifying young person in hospital or residential accommodation
to remain entitled, so long as the partner does.