21.0.3. For the purposes of this Part, affiliated persons, or persons affiliated with each other, are(a) an individual and a spouse of the individual;
(b) a corporation andi. a person by whom the corporation is controlled,
ii. each member of an affiliated group of persons by which the corporation is controlled, or
iii. a spouse of a person described in subparagraph i or ii;
(c) two corporations, ifi. each corporation is controlled by a person, and the person by whom one corporation is controlled is affiliated with the person by whom the other corporation is controlled,
ii. one corporation is controlled by a person, the other corporation is controlled by a group of persons, and each member of that group is affiliated with that person, or
iii. each corporation is controlled by a group of persons, and each member of each group is affiliated with at least one member of the other group;
(d) a corporation and a partnership, if the corporation is controlled by a particular group of persons each member of which is affiliated with at least one member of a majority-interest group of partners of the partnership, and each member of that majority-interest group is affiliated with at least one member of the particular group of persons;
(e) a partnership and a majority-interest partner of the partnership;
(f) two partnerships, ifi. the same person is a majority-interest partner of both partnerships,
ii. a majority-interest partner of one partnership is affiliated with each member of a majority-interest group of partners of the other partnership, or
iii. each member of a majority-interest group of partners of each partnership is affiliated with at least one member of a majority-interest group of partners of the other partnership;
(g) a person and a trust, if the personi. is a majority-interest beneficiary of the trust, or
ii. would, but for this paragraph, be affiliated with a majority-interest beneficiary of the trust; and
(h) two trusts, if a contributor to one of the trusts is affiliated with a contributor to the other trust andi. a majority-interest beneficiary of one of the trusts is affiliated with a majority-interest beneficiary of the other trust,
ii. a majority-interest beneficiary of one of the trusts is affiliated with each member of a majority-interest group of beneficiaries of the other trust, or
iii. each member of a majority-interest group of beneficiaries of each of the trusts is affiliated with at least one member of a majority-interest group of beneficiaries of the other trust.