26 USC 2651 - Generation assignment

(a) In general 
For purposes of this chapter, the generation to which any person (other than the transferor) belongs shall be determined in accordance with the rules set forth in this section.
(b) Lineal descendants 

(1) In general 
An individual who is a lineal descendant of a grandparent of the transferor shall be assigned to that generation which results from comparing the number of generations between the grandparent and such individual with the number of generations between the grandparent and the transferor.
(2) On spouse’s side 
An individual who is a lineal descendant of a grandparent of a spouse (or former spouse) of the transferor (other than such spouse) shall be assigned to that generation which results from comparing the number of generations between such grandparent and such individual with the number of generations between such grandparent and such spouse.

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(3) Treatment of legal adoptions, etc. 
For purposes of this subsection
(A) Legal adoptions 
A relationship by legal adoption shall be treated as a relationship by blood.
(B) Relationships by half-blood 
A relationship by the half-blood shall be treated as a relationship of the whole-blood.
(c) Marital relationship 

(1) Marriage to transferor 
An individual who has been married at any time to the transferor shall be assigned to the transferors generation.
(2) Marriage to other lineal descendants 
An individual who has been married at any time to an individual described in subsection (b) shall be assigned to the generation of the individual so described.
(d) Persons who are not lineal descendants 
An individual who is not assigned to a generation by reason of the foregoing provisions of this section shall be assigned to a generation on the basis of the date of such individuals birth with
(1) an individual born not more than 121/2 years after the date of the birth of the transferor assigned to the transferors generation,
(2) an individual born more than 121/2 years but not more than 371/2 years after the date of the birth of the transferor assigned to the first generation younger than the transferor, and
(3) similar rules for a new generation every 25 years.

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(e) Special rule for persons with a deceased parent 

(1) In general 
For purposes of determining whether any transfer is a generation-skipping transfer, if
(A) an individual is a descendant of a parent of the transferor (or the transferors spouse or former spouse), and
(B) such individuals parent who is a lineal descendant of the parent of the transferor (or the transferors spouse or former spouse) is dead at the time the transfer (from which an interest of such individual is established or derived) is subject to a tax imposed by chapter 11 or 12 upon the transferor (and if there shall be more than 1 such time, then at the earliest such time),

such individual shall be treated as if such individual were a member of the generation which is 1 generation below the lower of the transferors generation or the generation assignment of the youngest living ancestor of such individual who is also a descendant of the parent of the transferor (or the transferors spouse or former spouse), and the generation assignment of any descendant of such individual shall be adjusted accordingly.

(2) Limited application of subsection to collateral heirs 
This subsection shall not apply with respect to a transfer to any individual who is not a lineal descendant of the transferor (or the transferors spouse or former spouse) if, at the time of the transfer, such transferor has any living lineal descendant.
(f) Other special rules 

(1) Individuals assigned to more than 1 generation 
Except as provided in regulations, an individual who, but for this subsection, would be assigned to more than 1 generation shall be assigned to the youngest such generation.
(2) Interests through entities 
Except as provided in paragraph (3), if an estate, trust, partnership, corporation, or other entity has an interest in property, each individual having a beneficial interest in such entity shall be treated as having an interest in such property and shall be assigned to a generation under the foregoing provisions of this subsection.
(3) Treatment of certain charitable organizations and governmental entities 
Any
(A) organization described in section 511 (a)(2),
(B) charitable trust described in section 511 (b)(2), and
(C) governmental entity,

shall be assigned to the transferors generation.