I also found this obit which mentions a Gilman Loberg of Amherst as a half-brother and a Mrs Melvin Quam of Chicago as a half sister, so maybe Selma remarried?:
Harris N Gullikson
Harris N Gullikson, 75, a native of the Town of New Hope, died early Wednesday at his home in Elderson. He had been in ill health the past two years.
The funeral will be at 2 p.m. Saturday in the Schmidt Funeral Home in Wittenberg. Friends may call there from Friday evening until the services. Burial will be in Evergreen Cemetery, Eldron.
Mr Gullikson was born Sept 25, 1881 in New Hope. He was married to the former Carrie Bennett in Eldron in 1913. His wife preceded him in death in 1922
A retired strawberry grower, he had also served as Elderon village clerk, health officer, a member of the draft board during World War II and was chairman of the Red Cross drive for many years. He lived in Eldron the past 45 years.
Surviving are a half-sister, Mrs Nelville Quam, Chicago, and a half brother, Gilman Loberg of Amherst. The couple had no children.
Roger Marquardt of Oshkosk,a member of the Jehovah's Witnesses, will officiate at the funeral. Henry Ornitt, Gordon Gunderson, Arthur Marsh, Ross Whitney, Al Schwalbach and Barton Plowman will serve as pall bearers.
Stevens Point Daily Journal, Thursday May 23, 1957