11.3.Notwithstanding section 18 of the Act respecting prescription drug insurance (chapter A-29.01), an eligible person referred to in that section shall ensure that coverage is provided to his child and spouse as beneficiaries under the group insurance contract or employee benefit plan applicable to a given group of persons of which he is a member by reason of current or former employment, profession or any other habitual occupation, only if those persons are domiciled with him.