Peter Endrizzi born April 1899 is William Endrizzi born April 1899.The census taker must have written down the wrong first name.
World War I Draft Registration Cards, 1917-1918
Name Birth Date Race Birthplace Registration Place (City, County, State)
William Endrezze 30 Apr 1899 White Silver Bow, Montana
He would not have been allowed to register for the draft is he was born in 1900.
His birthdate is wrong here:
California Death Index, 1940-1997
Name: William E Endrezze Social Security #: 516228186 Sex: Male Birth Date: 30 Apr 1901 Birthplace: Montana Death Date: 22 Sep 1960 Death Place: Los Angeles Mother's Maiden Name: Yeager
1930 United States Federal Census
Name Parent or spouse names Home in 1930 (City,County,State) Estimated Birth Year Birthplace Relation
William Endrezze Anne Jefferson, Madison, Montana abt 1900 Montana Head Anne Endrezze William Jefferson, Madison, Montana abt 1902Wife Jean Endrezze William, Anne Jefferson, Madison, Montana abt 1926Daughter
Household Members: Name Age William Endrezze 30 Anne Endrezze 28 Jean Endrezze 4