Where a parent occupies a dwelling as his home and that dwelling is also occupied by a person, other than a non-dependant or a person who is provided with board and lodging accommodation, and that person is contractually liable to make payments in respect of his occupation of the dwelling to the parent, the amount or, as the case may be, the amounts specified in paragraph 19 of Schedule 2 to the Family Credit (General) Regulations 198745 which apply in his case, or, if he is not in receipt of family credit, the amounts which would have applied if he had been in receipt of that benefit.