1940 Census Fort Bragg, Mendocino, California, USA Paul W Matson, 49, born about 1891 in Finland, married, lodger, laborer in a saw mill
Paul's family is not with him. He is living in a large boarding house with other lodgers.
You can search the 1940 US Census on Ancestry.com. It is free. Search for "Mattson" in Fort Bragg, Mendocino, California. You will see there is no one with that name who could be his wife and children.
You will also see other Mattsons in California who were born in Finland. There are quite a few.