The creator of Pippi Longstocking, Astrid Lindgren, is the most translated author from Sweden, and has filled children's imaginations since the 1940s.
She lived in an apartment in Dalagatan in Stockholm for 46 years until her death in 2002 and soon its doors are set to open to the public by the end of 2015.
The move has long been mooted in the Swedish media and on Wednesday, Lindgren's grandson Olle Nyman told the newspaper Mitt i that the family's plans to turn it into a museum were underway.
"There is an association called the Astrid Lindgren Society which together with us is preparing a museum in the apartment. We believe and hope that it may be possible to open it later in the year," he said.
Astrid Lindgren's apartment has largely been untouched since the writer died in 2002.
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Nyman told Mitt i that the family did not want it to become an "ordinary" museum that tourists could visit spontaneously, rather a place where small groups could be taken on pre-booked guided tours.
Kjell Bohlund, chairman of the Astrid Lindgren Society previously told Swedish broadcaster SVT in December 2013 that the family was considering opening up the property.
"The home shows Astrid Lindgren the person, not the writer or the activist," he said.
Lindgren sold more than 144 million books worldwide, based on her memories of growing up in Vimmerby in south-eastern Sweden, playing in the country's deep forests and on the long sandy beaches.
Pippi Longstocking is her most famous character, a cheeky yet kind girl who can shoot a revolver, carry a horse and take on the strongest man in the world.
The stories have been turned into movies and television series and have also been brought to life at Astrid Lindgren's World, one of Sweden's most popular tourist attractions.