47Invalidity pension (dependant relative)
(1)Subject to subsection (2) below, the weekly rate of an: invalidity pension shall be increased by the amount specified in Schedule 4, Part IV, column (4)—
(a)for any period during which the pensioner's husband is incapable of self-support and either they are residing together or she is contributing to his maintenance at a weekly rate not less than the amount so specified; or
(b)for any period during which the pensioner has residing with him and is wholly or mainly maintaining such other relative as may be prescribed, being a relative in relation to whom such further conditions as may be prescribed are fulfilled.
In this subsection " relative " does not include any person who is a child.
(2)Where a person is entitled to an invalidity pension at a weekly rate determined under section 15(4) of this Act—
(a)subsection (1) above does not apply ; and
(b)if the pensioner would have been entitled only by virtue of section 33 to the retirement pension by reference to which the weekly rate of the invalidity pension is determined, the amount of an increase under this section of that weekly rate shall be that which would have been applicable by virtue of that section in the case of such an increase of the weekly rate of that pension.