[6] In 1893, she and her mother filed a suit alleging copyright violation of Stephen Foster's song, "Old Folks at Home".

[10] In 1906, Welch unveiled a model of the statue then being built in Frankfort, in honour of Stephen Foster and his song "My Old Kentucky Home".

[11] In 1913, citizens in Pittsburgh initiated fundraising to preserve Stephen Foster's place of birth in the city as a memorial to him.

[12] Philanthropist James H. Park bought the property outright the following year and asked Welch and Jessie Rose to become the live-in caretakers of the house.

[13] Park gave the house at 3600 Penn Avenue, known as the Stephen S. Foster Memorial Home, to the city of Pittsburgh in July 1916.

[16] Fletcher Hodges, Jr., who was the first curator of the Foster Hall Collection at the memorial, noted in 1948 that Marion Welch had "provided a link between her father and the present".

[24] Primary source material including family letters concerning the life of Welch are housed in the University of Pittsburgh Library System Archives Service Center.

[29][full citation needed] Welch's cause of death in 1935, aged 84, was a heart attack brought on by asthma.