Your grandfather was born Jan 8 and baptized feb 4, 1906 in Eidsberg, Østfold county not so very far from Oslo. His given name was Holm Torbjørn. His baptizm is in two church-books, no 5 in both:http://www.arkivverket.no/URN:kb_read?idx_kildeid=361&id...http://www.arkivverket.no/URN:kb_read?idx_kildeid=22804&...
He was born out of wedlock from parents:
Fredrik Larsen and Tora Amalia Larsdatter Berg.
Father was Arbeider ungk = worker bachelor (ungk short for ungkar). Residence Lillestrømmen.
Mother was hjm pige = unmarried girl living at home. Residence Mysen.