Martha Stewart, the iconic lifestyle mogul, grew up as the second of six children in a Polish-American household in Nutley, New Jersey, under the strict and demanding eye of her father, Edward Kostyra. Her five siblings—Eric Scott, Frank Kostyra, Kathryn Evans, Laura Plimpton, and George Christiansen—shared a childhood far removed from the polished brand she later built, as revealed in the 2024 Netflix documentary Martha. Two of her siblings have since died: Laura Plimpton in 2014 and George Christiansen in 2017. The three surviving siblings—Eric, Frank, and Kathryn—all participated in the documentary, speaking candidly about their upbringing.
The Kostyra Family: A Strict Polish-American Upbringing
Martha Helen Kostyra was born on 3 August 1941 in Jersey City, New Jersey, to Edward "Eddie" Kostyra (1912–1979) and Martha Ruszkowski Kostyra (1914–2007). When Martha was three, the family moved to Nutley, New Jersey, where she grew up alongside her five siblings. Her father, a pharmaceutical salesman and former teacher, taught her to garden at age three, while her mother taught her to cook and sew. The family was of entirely Polish heritage, with all four grandparents being Ellis Island-era immigrants from south-eastern Poland.
According to the siblings, Edward Kostyra was not merely hardworking and strict, as publicly portrayed, but "demanding" and "supercritical." Physical discipline was a feature of everyday life. Eric recalled in the documentary, as reported by The Jerusalem Post: "He would give us an order, and if we didn't follow through, we paid the penalty." Frank echoed this, stating simply: "We had our whippings." The children were also made to contribute to the household through gardening, bartering, and maintaining the home, as their father struggled financially.
Meet Martha Stewart's Five Siblings
Eric Scott Kostyra is the eldest sibling and the only older brother to Martha. A retired dentist living in Buffalo with his wife Helen, Eric is known for his craftsmanship—sculpting, carving, fabricating Tiffany lampshades, and building 18th-century American furniture. He was estranged from Martha for five years but reconciled in 2004 when she faced insider trading charges. He told The New York Post: "I could see the horrible agony and heartache in her eyes and in her face – I had to stop myself from tearing up." Eric also revealed that their father's harsh standards ruined gardening for him: "To this day, I despise gardening."
Frank Kostyra is the youngest brother and one of the three surviving siblings. He participated in the Martha documentary, discussing their father's strict parenting, but little else is publicly known about his personal or professional life.
Kathryn Evans (also known as Kathy) is the most private of the siblings. She appeared in the documentary (off-camera) and stood by Martha during her 2004 trial, attending proceedings alongside their mother. In the documentary, she recalled watching Martha's early modelling career: "Everybody stopped everything to watch Martha."
Laura Plimpton, the youngest sister, had the longest professional relationship with Martha, working for her for over 25 years as an editor, researcher, writer, and photographer. She died in August 2014 at age 59 from a massive brain haemorrhage. She was kept on life support so her three children could say goodbye and for organ donation testing. Martha described her on her blog: "Laura deserves the very best; she was an extraordinary mother, wife, and sister." Martha later dedicated a Japanese maple grove at her estate to Laura's memory.
George Christiansen, the baker, worked as a contractor and was reportedly very close to Martha. His company, Pequot Remodelling, spearheaded a renovation of one of Martha's homes. He lived in Fairfield, Connecticut, with his wife Rita, who worked in Martha's Connecticut offices. George died unexpectedly at age 65 from a suspected heart attack at his home. In Being Martha, he recalled their childhood: "It was all about going and finding a piece of land and living off of it, learning how to get back to nature."
Family Dynamics and the 2024 Netflix Documentary
Martha's relationships with her siblings are warm overall but complicated. Eric's five-year estrangement and reconciliation tell a fuller story. In the documentary, Martha discussed how her father instilled ambition: "Father instilled in all of us a sense that we could go farther than the ordinary person." The siblings described the childhood home as chaotic rather than idyllic, contrasting with public portrayals.
The 2024 documentary Martha, directed by R. J. Cutler, debuted on Netflix on 30 October 2024. All three living siblings—Kathryn Evans, Eric Scott, and Frank Kostyra—participated but opted to remain off-camera. Martha has since described the film as "a bit lazy" to The New York Times, yet the candid family accounts resonated widely with viewers.
Martha Stewart's Net Worth and Legacy
Martha Stewart has a net worth of $400 million, consistently estimated by Celebrity Net Worth and Parade. Her income sources include publishing (over 100 books, including Martha: The Cookbook in 2024), television and streaming deals, homeware and product licensing, real estate holdings in New York, Maine, and Connecticut, and brand partnerships including with Snoop Dogg. In 2023, at age 81, she appeared on the cover of Sports Illustrated Swimsuit, becoming the oldest cover model in the publication's history.
Her mother, "Big Martha" Kostyra, a retired teacher, died in November 2007 at Norwalk Hospital of undisclosed causes at age 93. The Kostyra family story, as told by Martha's siblings, offers a more revealing glimpse into the strict, demanding household that shaped the woman she became, marked by resilience, estrangement, and reconciliation.
