According to the naturalization papers of an Erick Alfred Nelson, he immigrated April 13, 1904, married to Martha who was born January 29, 1889, at Detroit, Michigan, employed as an iron worker, has a son, Ralph, born March 15, 1910, at Portland, OR. His petition also asks that his name be changed to Fred Nelson. (This was signed 1922) His declaration of intention shows his wife was born in Minnesota.(This was signed 1919)
The 1910 census which you referenced shows Fred & Martha with baby Ralph who was listed as age 1/12.
Name: Ralph Nelson SSN: 573-14-6690 Born: 15 Mar 1910 Died: 5 Oct 1990 State (Year) SSN issued: California (Before 1951)