Emigration to Bergen, 1903

I know that my great grandmother and her siblings traveled to Norway, we are assuming Bergen, in 1903 after both their parents died. I can find one sibling who stayed in Norway and would die in 1940 of typhus, but all the rest of the children went back to the US, probably through Boston since that is where my great grandmother met my great grandfather. I cannot find their ship manifest. No idea of the ship name or date of sail. Thoughts? Their mother's maiden name was Magnesen in the US, Rasmusdatter in Norway Ragna Sophie Hansen 15 APR 1889 in Chicago, Cook County, Illinois, United States Pearl Mabel Hansen 1 Aug 1890 in Chicago, Cook, Illinois, United States Charlotte Mary Hansen 01 MAR 1892 in Chicago, Illinois, United States Charles Walter Hansen 14 JUL 1899 in Chicago, Illinois, United States Gerhard Edvin Chester Hansen (He was a foster child of a family named Knutsen in Bergen in 1910) 16 AUG 1901 in Chicago, Illinois, United States Florence Fredrika Hansen Seaver 7 Sep 1902 in Chicago, Cook, Illinois, United States