Berthel Grønbek

Hi ! I just recently found out that my Ancestor Hans Henrich Grønbek (born around 1790 inTjøtta Parish, Nordland, Norway) had his roots in Denmark. In the 1801 Census his Father is listed as Berthel Grønbek (born 1756). Would anyone know anything about this and would it be possible to trace Berthel's Ancestry back in Denmark ? Do I have any living relatives in Denmark / thank you ever so much. Doris Overbo