2.2.In oktober 2011 is de moeder van belanghebbende, [E] overleden (de moeder). Zij liet na: zoon [F] dochter [G] en belanghebbende. In het testament van de moeder (het testament) is, voor zover hier van belang, het volgende bepaald:
“I. Personal and Household Effects. I give all my articles of personal or household use, including automobiles, together with all insurance relating thereto, to such of my children who survive me, to be divided among them as they may agree. I may leave a memorandum setting forth suggestions as to the distribution of certain items and, while the memorandum is not to be legally binding, I hope the suggestions in it will be carried out.
My executor may make whatever arrangements my executor deems appropriate for storing and delivering articles of personal or household use to the beneficiaries, and may pay the cost thereof and any related expenses including insurance from my residuary estate.
II. Exercise of Power of Appointment.
I hereby exercise the power of appointment given to me in article VI-B of the will of my husband, [H] , by appointing all property subject thereto to such of my children who survive me, in equal shares (subject to the provisions of article IV below); provided that if a child does not survive me but has descendants who survive me, such descendants shall receive, per stirpes, the share that child would have received had he or she survived me. Except as just provided, no provision of this will shall exercise any power of
appointment I may have.
III. Residuary Estate. I give the residue of my estate, real and personal, to such of my children who survive me, in equal shares (subject to the provisions of article IV below); provided that if a child does not survive me but has descendants who survive me, such descendants shall receive, per stirpes, the share that child would have received had he or she survived me; (…).
IV. Trust for [X] . Notwithstanding the foregoing provisions, any principal distributable to my daughter [X] shall be distributed to my trustee, IN TRUST to keep it invested as a separate trust and thereafter:
A. During my daughter [X] ’s lifetime:
1. As much of the net income and the principal as my trustee may from time to time think desirable - taking into account funds available from other sources - for the health, support, or education of [X] or any of her descendants shall be applied directly for those purposes; and
2. Any net income not so applied shall from time to time be accumulated and added to the principal.
(…)
B. At my daughter [X] ’s death, any then remaining principal shall be paid:
1. To or in trust for such one or more of her descendants on such terms as she may appoint by a will specifically referring to this power of appointment; provided that this power shall be subject to the Expansion of Testamentary Powers of Appointment article; or, in default of appointment or insofar as it is not effective,
2. To her then-living descendants, per stirpes; or, in default of such descendants,
3. To my then-living descendants, per stirpes; or, in default of such descendants;
4. To my heirs under the Pennsylvania intestate law;
Provided that funds attributable to my exercise of a power of appointment may be paid only to my husband’s descendants.
V. Expansion of Testamentary Power of Appointment. The testamentary power of appointment given to [X] under the preceding article shall, with respect to the sub-trust not exempt from federal generation-skipping transfer tax, be expanded to include the power, with the written consent of my trustee, to appoint to her estate.
(…)
XXII. Executors and Trustees. I appoint my son [F] executor of this will. I appoint my son, [F] , and my daughter, [G] , trustees under this will. (…)”