Mathea Halvorsen

I am looking for any information on mathea Halvorsen she lived in Norway she never Came to America her son Known here as Emil Olsen came in 1878 he was approximatly 20 I have names of his father possibly Hans Olsenor Hans mathson or Ole Olsen I have an old address from norway as 20 stensgt Krisitiana Norway I ve checked various way but not speaking norweigian I am stuck I know he went to norway to visit his parents in 1914 july 8th,on the kristianafjord but I can t even find anything on a return trip I know he did return He had left Four brothers and three sisters in norway I also believe he was related to a burkara Olsen who past away shortly but I dont know her or anything more on that any info would be appericated thank you Angela