Question: What year was Sara Alstrom's sister born?

Context paragraphs:
Sara Kamil-Yusof: Sara Kamil-Yusof (born 18 December 1984 in Petaling Jaya, Selangor) is a Malaysian synchronised swimmer.  She started synchronised swimming at the age of 12 in early 1997.  A few months later, her coach retired and Sara stopped swimming.  But later that year she was invited to join several other girls for a training stint for a few months in Canada for an upcoming national competition.

Albert Stern (violinist): Violinist Albert Ivan Stern was born in New York City.  His parents, father Murray Abraham Shmulevitch and mother Grace Sara Stern (née Gold), were both Jewish and born in Poland.  Grace Gold immigrated to the US as a child and Murray immigrated later after graduating from Humboldt University of Berlin as a Doctor of medicine.  After arriving in the US, Murray entered a lifelong career in business sales and, following in the footsteps of his father, became a prominent builder.  Both his mother and father came from families of predominantly musicians.  He had an older brother Stanley Stern (later known as Jack Stern) and an older sister Florence London.  Stern has 4 children, daughters Adina T. Stern, a prominent attorney, Aura L. Stern, a financier, daughter Shereen A. Stern, a nurse, and son Shawn Stern, a novelist.  He is married to Patricia A Stern (Née Trzaska).

Sara Alström: Sara Catharina Alström (born October 28, 1975 in Stockholm) is a Swedish actress.  She started acting when she was 11 years old, then together with her younger sister Hanna.  She studied at Balettakademien 1993–95 and Kulturama 1994–96 and later in New York City at Actors Studio and Stella Adler Studio of Acting.

Born to Fly: Born to Fly is the third studio album by Sara Evans, released in October 2000.  It is her highest-selling album to date, having earned 2× Platinum certification by the RIAA for U.S. sales of two million copies.  The lead single, "Born to Fly," reached number one on January 19, 2001.  The album was one of the most successful of the year.  Evans was nominated for five CMA Awards: Album of the Year; song, single, and music video (for the title-track), and Female Vocalist of the Year.  She won her first CMA award for music video of the year, "Born to Fly."  The international version of the album includes a bonus track, "You", which was later released in North America as a bonus track on her 2005 album, "Real Fine Place".  "Born to Fly" was a defining album for Sara.  Her earlier albums had a more neotraditional country sound, while all of her later albums had a more crossover-friendly country pop sound, similar to Martina McBride and Faith Hill.

Sara Ahmadi: Sara Ahmadi (Persian: سارا احمدی‎ ‎ ) (born 19 March 1978 in Tehran) is an Iranian daf and dayereh player and the lead composer of Kaliveh Group.  She is the sister of Asieh Ahmadi.

Princess Sara bint Faisal: Princess Sara bint Faisal of Jordan (born 27 March 1997) is the daughter Prince Faisal bin Hussein and Princess Alia, and a niece of King Abdullah II of Jordan.  She is the younger sister of Princess Ayah and Prince Omar, and is also twin to Princess Aisha.  Princess Sara currently attends Amman Baccalaureate School and is a senior.

Sara Jordan Powell: Sara Jordan Powell (born October 6, 1938) is an American gospel musician.  Her first works, "Touch Somebody's Life" and "When Jesus Comes," were released in 1972, and got significant radio airtime.  She has released an album that was produced by James Cleveland, "Touch Somebody's Life," which came out in 1975 on Savoy Records.  Powell released four more albums on that label, 1980's "I Must Tell Jesus", 1990's "Sara Jordan Powell" and "When Jesus Comes to Stay," and 1995's "The Soul of Sara Jordan Powell."  Subsequently, she released one album with Compendia Music Group that same year, "Live in Houston."  Her music even has been performed at the White House.  She performed in 1979 for President Jimmy Carter, and she was joined by Chuck Berry, Billy Eckstine, Evelyn "Champagne" King, and Andraé Crouch.  President Ronald Reagan appointed her to serve on the Year of the Bible Committee.  She got the opportunity to minister to President Bill Clinton in Memphis, Tennessee, at the request of Bishop Louis Henry Ford, along with Dr. Vernard Johnson.

Hanna Alström: Hanna Carolina Alström (born July 7, 1981) is a Swedish actress.

Adam Emmenecker: Adam Cannata Emmenecker (born December 3, 1985) is an American basketball player who completed his college career as a point guard at Drake University in Des Moines, Iowa in 2008.  During the 2007-08 basketball season, Emmenecker, who had been a walk-on (non-scholarship player) for his first three years at Drake, emerged from obscurity to lead the Bulldogs to a sweep of the regular-season and tournament titles in the Missouri Valley Conference, and received numerous honors for his performance as both a player and a student.  Born in Saginaw, Michigan, Adam's parents are Michael A. Emmenecker and Jo Ann B. Cannata.  He has one sister, Sara C. Emmenecker.  Adam completed his first marathon on October 18, 2015 by running the Des Moines Marathon in 4:21:27.

Joan Evans (charity worker): Sister Joan Evans, PBVM is a retired Australian religious sister born in 1931 who was based in the Klong Toei slums in Bangkok, Thailand.  She is a member of the Western Australian Congregation of Presentation Sisters.  Sister Joan is a charity activist, who helps the needy youth and families in the slums of the Thai capital.  Each fortnight, Sister Joan's project supports around 100 babies with deliveries of powdered milk.

Supporting paragraphs: Sara Alström Hanna Alström
Answer: 1981