By HEIDI FENTON The Muskegon Chronicle An AP Member Exchange HESPERIA — The resemblance between siblings Traudy Schwenk and Arnold Nikolaisen is unmistakable: The pale skin, gently rounded face and unique shape of the eyes. But within those eyes is a world of difference — brought on by years of living apart. Nikolaisen grew up in Minneapolis and joined the Navy, traveling the world by the age of 20. Schwenk was raised in a strict German family and lived in Michigan with her mother well into her adult years. The two shared a common thread: Schwenk and Nikolaisen grew up believing they were only children. That belief was shattered last June when Schwenk, 76, made a trip to the Hesperia Community Library to attempt to trace her genealogy. She knew she had been adopted but had little more to go on than the name of her birth father. It was on that day she discovered Nikolaisen, the brother she never knew she had.