My mother, who's name by the way, is also Carolyn, just finished a History of our Wallin family.
What struck me as interesting, is that we have a known Wallin relative (Lars Petter Wallin) who came from Gotland Sweden who went to New York in April 1882, then to Wahoo Nebraska....and later to Chase County Nebraska where my family still resides.
The odd thing-- one of our ancestors didn't follow Lars from New York, and has never been found since. Lars married his cousin Christina Maria...a daughter of Jonas Wallin. Christina came to America in 1885 with 3 children, Carl Oscar, Emma, and Anna. Could this be the Carl you are looking for? Is your family the one we are looking for?