Sigurd Hesselberg/Hans Henrik Stoermann Naess

my great uncle was named sigurd hessleberg and he founded and sold a large construction/road paving company of the same name- died in 1929. wife named Agnes. cant find any children-decedents. Sigurd was son of Eilert who was son of Abraham. They lived in oslo. His sister, my aunt Christine married Hans henrik stoermann- naess who won a god medal in 1920 olympics. Again same question. they lived in Bergen but cant find children of that marriage. Should I be focusing on NAESS or Stoermann- NAESS? I dont see where any of the Hesslebergs were christianed and there seems to be few of that name in Norway today. i am new to this, and would deeply appreciate any assistance. we would love to know who are present day cousins in Norway are, but we lose the trail after 1929.