Ernest Frederick birth registered in the September Quarter of 1880 in the Truro District of Cornwall Volume 5c p159.

Ernest Frederick Hawke marriage to Lilian Margaret Hayes registered June Quarter of 1906 in the Truro District of Cornwall - Volume 5c p205.

this is from the 1881 UK Census for Ernest Frederick Hawke


name: Ernest F Hawke
age: 0
gender: Male
birth year: 1881
birthplace: Truro, Cornwall, England
relationship to head of household: Son
marital condition: Single
address: Daniel St
census place: Kenwyn, Cornwall, England
record type: Household

This Ernest F Hawke's family Census 1881


Name: Frederick Hawke
Age: 31
Gender: Male
Birth Year: 1850
Birthplace: Truro, Cornwall, England
Relationship to Head of Household: Head
Marital Condition: Married
Profession/Occupation: Compositor (Printer)
Address: Daniel St
Census Place: Kenwyn, Cornwall, England
Disability:
Record Type: Household


Name: Elizabeth G Hawke
Age: 32
Gender: Female
Birth Year: 1849
Birthplace: Truro, Cornwall, England
Relationship to Head of Household: Wife
Marital Condition: Married
Profession/Occupation:
Address: Daniel St
Census Place: Kenwyn, Cornwall, England
Disability:
Record Type: Household


Name: John Hy Hawke
Age: 10
Gender: Male
Birth Year: 1871
Birthplace: Truro, Cornwall, England
Relationship to Head of Household: Son
Marital Condition: Single
Profession/Occupation: Scholar
Address: Daniel St
Census Place: Kenwyn, Cornwall, England
Disability:
Record Type: Household


Name: Mary Emma Hawke
Age: 6
Gender: Female
Birth Year: 1875
Birthplace: Hereford, Herefordshire, England
Relationship to Head of Household: Daughter
Marital Condition: Single
Profession/Occupation: Scholar
Address: Daniel St
Census Place: Kenwyn, Cornwall, England
Disability:
Record Type: Household

Ernest's brother John Henry's birth registered in the June Quarter of 1870 in the Truro District of Cornwall Volume 5c p176.

Sister Mary Emma registered in the March Quarter of 1875 in the Hereford District of Herefordshire Volume 6a p531

John Henry Hawke b1871 Truro, and sister Mary Emma b1875 Hereford were the children of Frederick Hawke and his first wife Mary Emma Sanders.

Frederick & Mary married 24 Dec 1869 Truro Sep 1869, vol.5c, page 165.

Details of the marriage can be found at this site
http://www.cornwall-opc-database.org/index.php

Mary died 1875 in Hereford Herefordshire Mar 1875, vol.6a page 425 (registered as Emma Hawke)

1871 Census for Frederick & Mary Emma

1871 England Census about Fredk Hawke
Name: Fredk Hawke
[Frederick Hawke]
Age: 22
Estimated Birth Year: abt 1849
Relation: Son-in-law
Spouse's Name: Mary Emma Hawke
Gender: Male
Where born: Truro, Cornwall, England
Civil parish: St Clement
Ecclesiastical parish: St Paul
County/Island: Cornwall
Country: England
Registration district: Truro
Sub-registration district: St Clement
ED, institution, or vessel: 8
Household schedule number: 103
Piece: 2281
Folio: 30
Page Number: 18
Household Members:
Name Age
John Sanders, Head 31 b Luxilian Cornwall - Gardner
Eliza Sanders, wife 45 b St Austell Cornwall
Jno Henry Sanders, son 16 b Redruth Cornwall - Confectioner
Fredk Hawke, son in law 22 b Truro Cornwall - Compositor
Mary Emma Hawke, daug 18 b Camborne Cornwall
Jno Henry Hawke, grandson 10 Months b Truro Cornwall
Thomas Wills, Boarder 26


Frederick married Elizabeth Gordon Williams Truro Sep 1879, vol.5c, page 165

Ernest had a younger sister Hilda Frances Hawke Truro Mar 1889, vol.5c, page 148

The 1891 Census is very faint and hard to read.

1891 England Census about Ernest F Hawke
Name: Ernest F Hawke
Age: 10
Estimated Birth Year: abt 1881
Relation: Son
Father's Name: Frederick Hawke
Mother's name: Elizabeth V Hawke
Gender: Male
Where born: Truro, Cornwall, England

Civil parish: Kenwyn
Ecclesiastical parish: St Georges
County/Island: Cornwall
Country: England

Street Address:32 Daniels Street, Kenwyn Truro

Registration district: Truro
Sub-registration district: Kenwyn
ED, institution, or vessel: 4
Neighbors: View others on page
Piece: 1830
Folio: 58
Page Number: 15
Household Members:
Name Age
Frederick Hawke 41
Elizabeth V Hawke 42
Ernest F Hawke 10
Juld Hawke 2 (Hilda)

1901 Census

1901 England Census about Hilda Frances Hawke
Name: Hilda Frances Hawke
Age: 12
Estimated Birth Year: abt 1889
Relation: Daughter
Father's Name: Frederick Hawke
Mother's name: Elizabeth Hawke
Gender: Female
Where born: Cornwall, England

Civil parish: Kenwyn
Ecclesiastical parish: Kenwyn St George
County/Island: Cornwall
Country: England

Street Address: 32 Daniels Street

Registration district: Truro
Sub-registration district: Kenwyn
ED, institution, or vessel: 4
Neighbors: View others on page
Household schedule number: 221
Piece: 2222
Folio: 72
Page Number: 33
Household Members:
Name Age
Frederick Hawke, Head 51 Printer Compositer
Elizabeth Hawke, wife 52
Ernest Frederick Hawke,son 20 Church Organist
Hilda Frances Hawke, daug 12
James Hawke, Grandfather, 75 Church Verger

1911 Census

1911 England Census about Hilda Francis Hawke
Name: Hilda Francis Hawke
Age in 1911: 22
Estimated Birth Year: abt 1889
Relation to Head: Daughter
Gender: Female
Birth Place: Truro, Cornwall
Civil parish: Kenwyn
County/Island: Cornwall
Country: England
Street Address: 32 Daniel Street, Truro, Cornwall
Marital Status: Single
Occupation: Music Teacher
Registration district: Truro
Registration District Number: 296
Sub-registration district: Kenwyn
ED, institution, or vessel: 3
Household schedule number: 215
Piece: 13854
Household Members:
Name Age
Frederick Hawke, Head 61 Printer Compositer
Elizabeth Hawke, Wife 62
Hilda Francis Hawke, daug 22 Music Teacher

Frederick & Elizabeth married 31 years 2 children both living.

Ancestry has quite a bit of information on the Hawke family also try familysearch.org site it has a few references for Ernest.