Trying to find Sailor

I am looking for my gggrandfather Olouse lived in Trondheim, Norway and was married to Catherine Olson in Trondheim. He was a fisherman and drowned in a storm when he was about 80 years old. I am very confused about his name because his son was named Karl Magnus Olausen. Born either 1849 or 1845 in Brono Parish. Karl was also a Sailor. He married Maria Fredrikke Tiberg. They had 3 sons, Alfred Marenius, Peder Olaf and Anton Eliser. After Olouse's death, Catherine married Andrew Anderson, a veterinarian. she lived to be over 100 years old. Any help would be appreciated. Thank you Traci Joppru