Andrew,
Hildur, an only child, never married or had children. She continued to live with her parents at a little, more or less dilapidated farm near Cato, New York all of her adult life. She has a first cousin in Canada who told me that they always loved to visit the Hirvonens because there were chickens and other farm animals to play with and so many old buildings and barns to explore. Although not fancy digs, it was a fun place for the children to visit.
When Hildur was in her mid 40's she was diagnosed with cancer and died on April 12, 1956 at the age of 46. Both parents survived her and her mother, also a Titanic survivor, died on May 17, 1961. The husband and father, Alex Hirvonen, lived out his last years in a hotel room having lost his entire family. Despondent even after several years of being a widower and in failing health, he committed suicide on March 17, 1964. What possessions remained passed to Alex Hirvonen's sister in Buffalo, New York and to her two children.
Regards,
Phillip