Table:
0
A
B
C
D
E
F
G
1
Name
Deceased Spouse
Cause of Death
Date of Spouses Death
Length of Marriage
Children Together
Current Marital Status
2
Samuel Beckett
Suzanne Déchevaux-Dumesnil
Unknown
July 17, 1989 (aged89)
28 years
None
Deceased (1989)
3
Jan Berenstain
Stan Berenstain
Unknown
November 26, 2005 (aged82)
59 years
2 Sons (Leo, Michael)
Deceased (2012)
4
Ray Bradbury
Marguerite McClure
Not Known
November 24, 2003 (aged81)
56 years
4 Daughters (Susan, Ramona, Bettina, Alexandra)
Deceased (2012)
5
Mary Welsh Hemingway
Ernest Hemingway
Suicide
July 2, 1961 (aged61)
15 years
None (miscarriage)
Deceased (1986)
6
Norris Church Mailer
Norman Mailer
Acute Renal Failure
November 10, 2007 (aged84)
27 years
1 Son ( John )
Deceased (2010)
7
Frederica Sagor Maas
Ernest Maas
Natural Causes
July 21, 1986 (aged94)
59 years
None
Deceased (2012)
8
Edgar Allan Poe
Virginia Eliza Clemm Poe
Tuberculosis
January 30, 1847 (aged24)
11 years
None
Deceased (1849)
9
Dr. Seuss
Helen Palmer Geisel
Overdose of Barbiturates
October 23, 1967 (aged68)
40 years
None
Deceased (1991)
10
Robert Treuhaft
Jessica Mitford
Lung Cancer
July 22, 1996 (aged78)
53 years
2 Sons (Nicholas, Benjamin)
Deceased (2001)

Questions and formulas:
Question: What was the cause of death in the marriage that lasted 28 years? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,E1="28 years"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G10,E2:E10="28 years"),3))
Level: medium
Question: How long were Ray Bradbury and his wife married?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,A1="Ray Bradbury"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G10,A2:A10="Ray Bradbury"),5))
Level: medium