Welcome to Just Answer and thanks for your question. I found a Walfred[sic] Erickson, age 50 (born about 1870 in Finland) in the 1920 CENSUS for Berlin, Wayne County, PA where he was a dairy farmer. He was widowed and living alone. Do you think this might be your grandfather?
In the 1910 Census for Duluth Ward 6, Saint Louis, Minnesota, Walfred Erickson, age 40, lived with his second wife Clara, age 28. They had been married two years and had two children, a daughter age 2 (name looks like Rundna) and a son just born who hadn't been named. Both children were born in Minnesota. His occupation is listed as saloon keeper. Clara was also from Finland and had arrived in the USA in 1903.
As I said, he was in the 1920 census for Berlin, Wayne Co., PA, (Walfred Erickson)listed as widowed, age 50, living alone. His occupation is listed as dairy farmer. He also stated that he arrived in the USA in 1901 and was not naturalized.
In the 1930 census, Walfred Erickson, age 58, is living in Palisades Park Borough, Bergen Co., NJ, at 70 W. Harwood Terrace with his wife Olga, age 46 who came to the USA in 1903. His occupation is listed as being a carpenter in the shipyard.
I did not find a death notice for him.