EIGHT If any part of my estate is held for a beneficiary who lacks full legal capacity my trustees shall have power:
(a) to pay or apply any part of the income or capital falling to that beneficiary for his or her benefit in any manner my trustees think proper.
(b) to retain the same until such capacity is attained, accumulating income with capital, or
(c) to pay over the same to the legal guardian or the person for the time being having the custody of that beneficiary, whose receipt shall be a sufficient discharge to my trustees.