(1) For the purposes of the application of the articles in the Civil Code, Cap. 4.01 relating to successions, to the devolution of property under section 118M, and for the purposes of the construction of a disposition under that section, an adopted person is deemed to be related to another person being the child or adopted child of the adopter or, in the case of a joint adoption, of either of the adopters —
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(a) if he or she was adopted by two spouses jointly, and that other person is the child or adopted child of both of them, as brother or sister of the whole blood; and
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(b) in any other case, as brother or sister of the half-blood.