Question: Who is Katherine Stieglitz's stepmother?

Jane Wigham
Jane Wigham( née Smeal; 1801–1888) was a leading Scottish abolitionist.
She was the stepmother of Eliza Wigham and the second wife of John Wigham.
Dorothy Granger
Dorothy Karolyn Granger( November 21, 1911 – January 4, 1995) was an American actress best known for her roles in short subject comedies in Hollywood.
She was also the stepmother of film maker and former record producer Anthony J. Hilder.
Henriette Feuerbach
Henriette Feuerbach( 13 August 1812 – 5 August 1892) was a German author and arts patron.
She was the wife of Joseph Anselm Feuerbach and the stepmother of painter Anselm Feuerbach, whom she supported in his art.
Verona Barnes
Verona Barnes( born December 29, 1946) is an American actress who appeared in multiple New York City theater plays.
She is the stepmother of actress Rachel True.
Her roles include Mrs. Harris and the Street Person in" All God's Chillun Got Wings," as well as Jack's friend in" The Great White Hope".
Peju Ogunmola
Peju Ogunmola is a Yoruba film actress who stars in Nollywood movies of Yoruba genres.
Her father was the veteran actor Kola Ogunmola.
She is the wife of Sunday Omobolanle, a 64- year- old Nigerian comic actor, playwright, film director, and producer.
She is the stepmother of Sunkanmi Omobolanle who is also an actor.
Susan Moody
Susan Moody( born 1940 in Oxford) is the principal" nom de plume" of Susan Elizabeth Horwood, an English novelist best known for her suspense novels.
After marrying Professor John Dalgleish Donaldson in 2001, she became the stepmother of his four children, including Crown Princess Mary of Denmark.
Alfred Stieglitz
Alfred Stieglitz HonFRPS (January 1, 1864 – July 13, 1946) was an American photographer and modern art promoter who was instrumental over his fifty-year career in making photography an accepted art form.
In addition to his photography, Stieglitz was known for the New York art galleries that he ran in the early part of the 20th century, where he introduced many avant-garde European artists to the U.S.
He was married to painter Georgia O'Keeffe.
Katherine Stieglitz
Katherine Stieglitz, or Katherine Stieglitz Stearns, (September 27, 1898 – November 20, 1971) was the daughter of Emmeline, or Emmy, and Alfred Stieglitz, an American photographer and modern art promoter.
She was the subject of many of her father's photographs, particularly in her early years.
They were exhibited and received praise for their wholesome sentiment.
She graduated from Smith College before marrying Milton Sprague Stearns.
After the birth of her son in 1923, she was institutionalized for depression and hallucinations and remained there until her death in 1971.
May Green Hinckley
May Green Hinckley( May 1, 1881 – May 2, 1943) was the third general president of the Primary of The Church of Jesus Christ of Latter- day Saints( LDS Church) from 1940 until her death.
She was the stepmother of Gordon B. Hinckley, fifteenth president of the LDS Church.
Irene Baker
Edith Irene Bailey Baker( November 17, 1901 – April 2, 1994) was an American politician and a United States Representative from Tennessee.
She was the widow of Howard Baker Sr. and the stepmother of Howard Baker Jr.

Answer: Georgia O'Keeffe