1841 census HO107 441/7 folio 49 page 1
Crouchfield Hemel Hempstead  Hertfordshire   
William Hollick 30 Hertfordshire Ag lab
Eliza Hollick 25  Hertfordshire
William Hollick 7  Hertfordshire 
Elizabeth Hollick 4  Hertfordshire
next door to
William Hollick 55 Hertfordshire Ag lab
Sarah Hollick 55 Hertfordshire
Henry Hollick 15 Hertfordshire Ag lab
next door 
Joseph Shepherd 30 Hertfordshire Blacksmith
Sarah Shepherd 9 not born Hertfordshire
William Shepherd 7 not born Hertfordshire
(Joseph Shepherd married William junior's sister Charlotte Hollick)
William Hollick senior aged 66 born Hensworth Hertfordshire Ag lab still living next door to Eliza on the 1851 census, which helps to establish the likely death date of Eliza's husband and her father-in-law.
Deaths Mar 1844   
HOLLICK  William    Hemel Hempd.  6 418   
Deaths Mar 1852   
HOLLICK  William     H. Hempstead  3a 115 
From the IGI and National Burial Index
MARY HOLLICK  
Christening:  25 DEC 1831   Hemel Hempstead, Hertford
Buried:  12 FEB 1832  Infant
Father:  WILLIAM HOLLICK  
Mother:  ELIZA  
FREDERICK HOLLICK    
Christening:  10 FEB 1833   Hemel Hempstead, Hertford
Buried:  22 MAY 1833    Infant
Father:  WILLIAM HOLLICK  
Mother:  ELIZA  
WILLIAM HOLLICK   
Christening:  08 JUN 1834   Hemel Hempstead, Hertford
Father:  WILLIAM HOLLICK  
Mother:  ELIZA  
ELIZABETH HOLLICK   
Christening:  25 DEC 1836   Hemel Hempstead, Hertford, 
Father:  WILLIAM HOLLICK  
Mother:  ELIZA  
EMMA HOLLICK  
Christening:  24 NOV 1839   Hemel Hempstead, Hertford
Burial:  12 JAN 1840  Infant  
Father:  WILLIAM HOLLICK  
Mother:  ELIZA  
LOUISA OLLICK  
Christening:  29 MAR 1841   Hemel Hempstead, Hertford
Burial:  04 APR 1841   Infant
Father:  WILLIAM OLLICK  
Mother:  ELIZA     
ELIZA OLLICK  
Christening:  18 JAN 1843   Hemel Hempstead, Hertford 
Father:  WILLIAM OLLICK  
Mother:  ELIZA  
11th February 1844
William Hollick aged 44
St John the Evangelist Boxmoor (this parish is not on the IGI)
This Hollick birth seems unaccounted for and not found on the 1861 census - no death registration for him either. Perhaps the name Shadrach became a bit of a mouthful and got changed to something more conventional?
Births Mar 1854   
Hollick  Shadrach    H Hempstead  3a 293 
William junior Eliza's husband had a brother called Shadrack
SHADRACK OLLICK   
Christening:  25 JUN 1825   Hemel Hempstead, Hertford 
Burial:  22 SEP 1825    
Father:  WILLIAM OLLICK 
Mother:  SARAH  
WILLIAM HOLICK  
Birth:  26 SEP 1806    
Christening:  04 JAN 1807   Hemel Hempstead, Hertford 
Father:  WILLIAM HOLICK  
Mother:  SARAH  
Regards
Valda