Before moving from the Reinfjell farm, nine children were born in the family, and living in Overoien, a 10th child, Josef Andreas, was born in 1896. The children of the family were:
- Mikal Alfred (1875-1953). He emmigrated to America in 1900
- Petra Amalie (1877-1946), who married Nils Nilsen Hagfors (1872-1948). Nils left Norway in 1914, and Petra and eight of their children emmigrated later, in 1919.
- Anna Olea Sofie (1879-1936), who married Nils Øybakken (1870-1954) in Vefsn
- Maren Dorthea (1882-1962), who married Birger Andreas Tverå in Mosjøen,
- Nils Normann (Norman Oien) (1884-1934). He emmigrated to America in 1902, and married Emma Dorothea Andersen from another farm in Øya. Emma had left Norway in 1903.
- Jørgine Kristine (Gina Oien) (1886-1954). She left Norway in 1906.
- Karoline Johanna (Caroline Oien) (1890-1962). She left Norway in 1911.
- Othar Olaus (1890). Carolines twin, died the same year.
- Lars Mathias Zahl Øien (1893-1972).
Lars Øien succeded his father as farmer in Overoien after Nils died in 1922. Lars was married to Ingrid, a daughter of Jørgen Ingebrigtsen, who had bought the Reinfjell farm from Nils in 1897. - Josef Andreas (Andrew Oien). He left Norway in 1914. In America he married Ellen Andersen from Øya, a niece of Emma Andersen.
As a farmer at Overoien farm, Nils Mikkelsen Renfjeld (or "Nils på Øya") contributed to the modernisation of agriculture in Vefsn. Among other things, he started using a reaper during World War I.