Halfdan Amundsen

I am trying to gather information on my grandfather's family- Halfdan Amundsen. He was born on January 17, 1893 in Christiania (Oslo) Norway. His father was Hans (Klaus) Amundsen born about 1860 and his mother was Olva Thilesen born about 1858. Hans was born in Odalen (Sondre) and Olva in Romedal, Norway. Halfdan was in the Merchant Marines and came to the United States to live in 1920. He may have traveled as crew on the ship Toledo Bridge and arrived in New York on May 17, 1920. He married Marget (Margaret) Johannson and lived in Brooklyn, New York for most of his life.