Lena Sophie (Heiden) Koster was born on Friday, October 7, 1881 as the seventh child born to August and Rika (Knaack) Heiden. She was born in the family home at 8700 South Custer Road.

She married John Koster, Jr. in Maybee, Michigan on Thursday, February 19, 1903 when Lena was 21 and John was 22 years old. John was born on Friday, May 28, 1880 in Germany.

In their married life, the couple lived at 2863 Radka Road in Dundee Township according to the 1930 U.S. Census. John's mother, Dora Koster, who was 91 at the time lived with them along with their two younger sons, Harold and Marvin.

By the 1950 U.S. Census, they were living with their grandson, Gerald John Koster in Bedford Township, Monroe County, Michigan. This is where John Koster, Jr. was residing  when he died on July 1, 1962 in Mercy Hospital in Toledo, Ohio. He was 82 years old.

At the time of her death on July 18, 1973, Lena was living with her youngest son, Marvin, on a farm at 11501 Dixon Road in Dundee Township. She was buried next to her husband at Maple Grove Cemetery in Dundee. Lena was 91 years old at the time of her death.
 

In this census, Heinrich (34) was living on South Custer Road with his parents, August (62) and Reka (59) Heiden and his sister, Lena (Koster) (19) and brother, John (16). Heinrich and Emma did not marry until 1901.
Lena (27), John (28) and their son, Erlin (6) were living in Dundee Township. John's mother, Dorothea Koster (72) who was born in Mecklenburg, Germany was also living the family.
Lena (39) and her husband, John Koster (40) and their children, Erlin (16), Harold (3) and Marvin (1). John's mother, Dorothea Koster (81) who was born in Mecklenburg, Germany was also living the family.
Lena (48) and her husband, John Koster (49) and their children,  Harold (12) and Marvin (10). Gerald Koster (5) (son of Lena and John's oldest son, Erlin) was included.  John's mother, Dorothea Koster (91) who was born in Mecklenburg, Germany was also living the family.
The family including John (59), Lena (59 and their son, Marvin (20) were shown living at 2863 Rad Road in Dundee Township, Monroe County, Michigan.
John (69) and Lena (68) were listed as living at 185 Fortuna in Bedford, Monroe County, Michigan.

North German (Köster): occupational name or status name for a tenant on a small farm, from Middle Low German koster, from kossater ‘cottager’.