Gravestone says born in 1856. Church record at Sankt Nikolaj Sogn (Køge), Ramsø Herred, Roskilde Amt, Denmark shows Hans Peter Nielsen was born 26 Dec 1857 to Jens Peter Nielsen { Weaver } and Louise Marie Hansen. He was baptized 5 Apr 1858.

In his "Declaration of Intention' to become a US Citizen filed on 11 Sep 1919 he lists his birthday as 26 Dec 1857.
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1870: the Danish Census lists:

Jens Peter Nielsen, 35, 1835, Husfader Væver (Weaver)
Lovise Maria Hansen, 41, 1829, Husmoder
Hans Peder Nielsen, 12, 1858, Søn
Lavrits Marius Nielsen, 9, 1861, Søn
Ana Johanne Nielsen, 6, 1864, Datter
Maria Nielsine Nielsen, 4, 1866, Datter
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1890, the Danish Census lists:

Hans Peter Nielsen, 32, 1858, Husfader Murer
    (bricklayer)
Jensine Kristine Margrethe Nielsen, 30, 1860
    Husmoder
Marie Kristine Nielsen, 10, 1880 Datter
Hans Peter Emil Nielsen, 8, 1882 Søn
Anna Ingeborg Nielsen, 5, 1885 Datter
Jens Valdemar Nielsen, 2, 1888 Søn

Jørgen Henrik Glæiser, 84, 1806 Husfader Agent og
    Kjøbmand (Agent and Merchant)
Ane Cathrine Glæiser, 83, 1807 Husmoder
Ane Kirstine Hansen, 23, 1867 Tjenestepige (Servant)

1901 Danish Census lists:
  Hans Peter Nielsen, age: 44, born: 1857, Husfader Murermester
  Jensine Kristine Margrete Nielsen, 42, 1859, Husmoder
  Hans Peter Emil Nielsen, 19, 1882, Søn Murersvend
  Jens Valdemar Nielsen, 14, 1887, Søn
  Johanne (aka Gerda) Nielsen, 11, 1890, Datter
  Svend Otto Nielsen, 7, 1894, Søn
  Garhardt Nielsen, 2, 1899, Søn
Placename: Nyportstræde. [ This is in Køge, Denmark, near Sct. Nikolaj kirke. ]
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1906, June 14th: Filed intention to become a Citizen of the United States.

1910 US Census, Chicago:
  ▪ Lists Hans as 52 years old, married 32 years, immigrated to US in 1906, speaks English, Dipper Metal
  ▪ Lists Jensine as 51 years old, married 32 years, with seven children born of which five are alive, immigrated to US in 1905, speaks Danish, no profession listed
  ▪ Lists Walter as 22 years old, single, immigrated to US in 1904, speaks English, Butcher Hams
  ▪ Lists Gerda as 19 years old, single, immigrated to US in 1903, speaks English, Laborer Tobacco
  ▪ Lists Otto as 16 years old, single, immigrated to US in 1905, speaks English, Apprentice Bricklayer

1910 US Census, School District 6 Springdale, Valley County, Montana:
  ▪ Lists Mrs Ingebor Benson { aka Anna Ingeborg Nielsen } as 25 years old, married 3 years, one child born and one alive, immigrated to US in 1905, speaks English, Housekeeper on Farm
  ▪ Lists Gehart (Brother-in-Law) as 11 years old, single, immigrated to US date is blank, speaks English, no profession listed

1915, April: Settled upon his Montana Homestead (N 1/2 NW 1/4 Section 21, Township 29N, Range 57E) and established actual residence thereon.

1919, April: House on homestead burned.

1920, Dec 17th: Hans died. He was buried on Dec 20th (per Ebenezer Lutheran Church records).
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In filing his paperwork for his homestead, he said his family consisted of "wife and six children".
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