Not found the family as yet but Hananiah would not have been with the family in 1861 as there is a passenger list for Hananiah travelling to New York in 1855:
Hannaniah Peters in the New York, Passenger Lists, 1820-1957
Name: Hannaniah Peters
Arrival Date: 14 Jun 1855
Birth Date: abt 1826
Age: 29
Gender: Male
Ethnicity/ Nationality: British (English)
Place of Origin: Great Britain
Port of Departure: Liverpool, England
Destination: United States of America
Port of Arrival: New York, New York
Ship Name: Empire State
Links in with his birth/baptism:
Hananiah Peter in the England & Wales, Non-Conformist and Non-Parochial Registers, 1567-1970
Name: Hananiah Peter
Birth Date: 5 Mar 1826
Gender: Male
Event Type: Baptism
Father: David Peter
Mother: Ann
Baptism Date: 1 Apr 1826
Baptism Place: Penmain, Monmouthshire, Wales
Denomination: Independent
Piece Title: Piece 1246: Penmain (Independent), 1787-1833
By 1867 he may have been in California:
Hananah Peters in the California, Voter Registers, 1866-1898
Name: Hananah Peters
Residence Year: 1867
Residence Place: Sierra, California
Age: 40
Birth Year: abt 1827
With regard to David and Ann
In 1841 & 1851 the family were living in the hamlet of Manmoel, Tredegar.
There is death for a Ann Peters: June 1852
Name: Age at Death (in years):
PETERS, ANN 60
GRO Reference: 1852 J Quarter in ABERGAVENNY Volume 11A Page 77
This looks quite good for Ann, right age and place.
Will keep looking for David