The clause which is relevant herein, which according to the Revenue, makes the trusts revocable ones we may refer to it as para 1(2) for the sake of convenience reads thus: "Anything hereinabove to the contrary notwithstanding, at any time and from time to time the Trustee shall transfer, convey and pay over any portion of the income of the trust fund and any portion or all of the principal held in trust to or to the use of such one or more members of a class composed of the Grantor, the wife or widow of the Gran tor, the children of the Grantor living from time to time, the spouse of any child of the Grantor then living or deceased (hereinafter referred to as the "Family Members"), and the descendants of the Family Members living from time to time, in such amounts, shares and proportions, either absolutely or in trust, and upon such terms and conditions (including the grant of a further power to appoint) as the Trustee and a Maharaja who shall have attained the age of eighteen (18 years) shall at any time and from time to time appoint and direct in a written instrument which refers to and specifically exercises this power and which is duly executed by the Maharaja and by the Trustee then acting here under.