18.—(1) A member who has purchased or inherited a residential property jointly with one or more persons shall not be entitled to make an application for the withdrawal of money under these Regulations unless the relationship between the co-purchasers or co-owners of the property falls within any of the following categories:
(a)
husband and wife;
(b)
parent and child;
(c)
brother and brother, sister and sister or brother and sister;
(d)
grandparent, parent and child;
(e)
grandparent and grandchild.
(2) Notwithstanding paragraph (1), the Board may, in its discretion, permit any withdrawal of money under these Regulations by a member who has purchased or inherited a residential property jointly with one or more persons, although the relationship between the co-purchasers or co-owners is not within any of the categories specified in paragraph (1).
(3) Where 2 or more co-purchasers or co-owners of a residential property each make an application for the withdrawal of money under regulation 9 or 10 or both, the total amount of money which may be withdrawn by them under either or both of those regulations shall not exceed the limit prescribed by regulation 12 or 14, as the case may be.