I found them in the 1910 census:
LAMONT, WILLIAM (1910 U.S. Census)
WASHINGTON , SKAGIT, LOOKOUT PCT
Age: 48, Male, Race: WHITE, Born: ME
Series: T624 Roll: 1667 Page: 75
Enumerated day not given
ED# 244 Page B9
Lines 69-74
Dwelling #20 Family #20

William Lamont Head M W 48y First marriage 12 years ME ME ME Laborer Logging Camp Rents home
Hattie Lamont Wife F W 31 First marriage 12 years KS VT VT
Edward Lamont Son M W 11 S MT ME KS
Minnie Lamont Dau F W 7 S MT ME KS
Harold Lamont Son M W 4 S MT ME KS
Loren Lamont Son M W 2 S MT ME KS

I could not find any of them in the 1920 census.
Eellitta