Thomas M Sandal / Dagny Jonette Fredrekka Sandal

Hello, I am looking for information on my great grandparents, In particular any information on their lifes (parents, siblings, birth, where lived, marriage, etc) in Norway before they came to the USA. I believe Thomas M Sandal was born in 1886 in Oslo/Kristiania, arrived in the USA 15 May 1907 on the Hellig Olav, residing in the USA until his death in 1964. His middle name might be Martin. Dagny Jonette Fredrekka Sandal nee Anderson/-sen, born 1886, arriving in the USA 1 Sept 1908 on the C F Tietgen, residing in the USA until her death in 1977. Together they had 5 children: Eva, Arne, Ralph, Ruth, Mae. Any information regrading their lives in Norway would be very interesting. Thank you in advance.