Any increase of farm assist payable under section 215(1) in respect of a qualified child who normally resides with the claimant or beneficiary and with the spouse of the claimant or beneficiary shall be payable at the rate of one-half of the appropriate amount in any case where the spouse, civil partner or cohabitant of the claimant or beneficiary
(a) is not a qualified adult, or
(b) is a spouse, civil partner or cohabitant referred to in section 214(2),
and section 215(1) shall be read and have effect accordingly.