I believe I have the birth records for Niels, but not Rasmus and I believe now that Niels and Carl S. were brothers, but Rasmus was not. I believe he was related through his wife who was the sister of the wife of Carl S. Nielsen.
There were 4 Sorensens and 1 Nielsen who were in the Boston area circa 1880 to 1900 who seemed to be all related. Niels Peter, b. 1842 , Soren C. b. 1848 and Michael b. 1854. All sons of a Peter Holm Sorensen and Kirstine Petersen apparently of the area around Aarhus.
I believe that Rasmus Severine Sorensen was a brother to the above 3 but he died and never came to America. His daughter however did and she was raised and adopted by Carl S. Nielsen. She was my husband's grandmother.
The other Sorensen was Niels Peter b. 1862 and who married CHristine Gregersen. He was brother or half brother to Carl S. Nielsen.
Are you related in any way to these Sorensens? Thank you so very much. Caroline Nielsen firstname.lastname@example.org