Where under the terms of a will or otherwise property is held for any person on condition that he survives another for a specified period of not more than six months, this Act shall apply as if the dispositions taking effect at the end of the period or, if he does not survive until then, on his death (including any such disposition which has effect by operation of law or is a separate disposition of the income from the property) had had effect from the beginning of the period.

Subsection (1) above does not affect the application of this Act in relation to any distribution or application of property occurring before the dispositions there mentioned take effect.