Alfred Knee was the husband of Nancy A. Tracy. These TRACYs are members of the family of Basil TRACY and Rachel LACY.
If your Sarah Tracy was born ca Jan 1877, she is the daughter of Basil Andrew Tracy (son of Basil) and Susan this line can be traced to Basil Tracy/Tracey and wife Chloe (probably Merryman), in Baltimore Co., MD and likely belong to descendants of 17th century family of Teague Tracey and Mary James.