You might want to follow up on familysearch.org to search for more details https://familysearch.org/.
From the census below:Frank D and Kate Sexton are listed in the 1900 WA census, with their children. Two of the daughters are named Mary. Gives birth month/year/location of all family members.
https://familysearch.org/pal:/MM9.3.1/TH-266-11670-20926-58?cc=1325221
Name: Sexton
1900 Census ED 131 Coal Creek, Forest, Logan, Newaukum, and Union Precincts, Lewis, Washington, United States
Years Married: 9
Estimated Marriage Year: 1891
Mother How Many Children: 5
Number Living Children: 4
Page: 6
Sheet Letter: A
Family Number: 104
Reference Number: 20
Film Number: 1241747
Digital Folder Number: 004118876
Image Number: 00125
Household Gender/Age/Birthplace
Head Frank D Sexton M/47/b. Aug 1853PA /NH/NY
Wife Katie Sexton F/30/ b. Dec. 1870WA/OR/CA
Daughter Mary F Sexton F/9/ b. Oct 1891WA
Daughter Mayo M SextonF/6/ b. Aug. 1894 WA
Daughter Mary E Sexton/F/5/ b. Mar 1895 WA
Son John D Sexton M/4/b. Dec. 1896 WA