Sister-in-law Sammantha (Shelpman) Piper Wife of George W. Piper
Aunt Anita Piper is living in Spokane at the same time GWI Jones is in Seattle (`1908), this could be another sister-in-law. See below:

Sister to Dr. John J. Piper and who lived in the state of Washington. I do know he was still living in 1887 when his mother died. I have also found the following information. "On March 18, 1881, Mr. Marcus D. Wright was united in marriage to Miss Bertie Piper, a daughter of Dr. John J. Piper, of Peone Prairie, Washington, who was for twelve years one of the county commissioners of Spokane county, Washington. Mrs. Wright passed away in 1901, being survived by her husband and seven children, two sons and five daughters". I have no other information on him.40