Seeking the Hardy family in 1910 census

In 1910 Charles F. Hardy, age 29, and his sister Grace B Hardy, age 19, were living with their father Fred A Hardy, age 54 widower, in Machias, Snohomish Co, WA.  Ancestry.com - 1910 United States Federal Census

I could not find Frank George Hardy in the 1910 census, but by the time of the WWI draft and in 1920 he is living with his sister, Augusta, and her children in Snohomish Co, WA.