'Johansen Holt' family to NZ/Sylvia Murch in Oz

I have been trying to find info regarding a family that emigrated from Norway to New Zealand, probably sometime around the 1870s or later. Here is what I have: I assume that 'Johansen Holt' is the father's name. I don't know his first name or his wife's first or last name. Their children's names in New Zealand were Michael (probably from Mikkel or similar), Ludvic/Ludvig, Martin Joseph, John (probably Johan), Oline, Sina. There may have been others. Michael, Ludvig, and Oline were older than Martin. John was probably older than Martin. John emigrated to the USA. He always signed his letters (from the USA) as John Johansen-Holt. Martin came to New Zealand at age 11 with his sister, Oline. It is not clear whether she was married at that time, but she married Norwegian lay minister Edward (Edvard) Nielsen who left Sor-Odal in 1874 bound for Auckland, New Zealand. Martin lived with the Nielsens (suggesting Oline and Edvard were already married) until his parents and older siblings emigrated. Edvard Nielsen was born Rakkestad, Norway, 1842. Martin Joseph Johansen Holt married Anne Louisa Amundsen (who emigrated to NZ aged 3 years aboard 1872 Høvding), daughter of Amund Amundsen. They had 3 children, Michael (b. 6/Jun/1891), Effie Grace (b. 6/Jun/1894), and Sylvia Henrietta Johansen Holt. Sylvia Johansen Holt was born 1897 (probably in April) in New Zealand. Her married name was Murch. Husband's first name unknown. Her husband died in 1963. Sylvia Murch (now deceased) and husband were living in Australia prior to 1958. She was living there again in 1970 when her address was 35 Guinness Street Everton Park Brisbane Australia Here is was I need: (1) the full names and birth dates/places of the 'Johansen Holt' parents; (2) Names (at birth) and birth dates/places for as many 'Johansen Holt' children as possible; (3) Emigration records for each family member; (4) Emigration records for Edvard Nielsen (was he married when he emigrated?); (5) Info on husband/children of Sylvia Henrietta Murch, nee 'Johansen Holt'; and (6) Date and place of death for Sylvia Murch. Thanks.