Hi Anita,Ithink you may have your census entries mixed up. the ages you give are their ages in 1891 not 1901.
this 1881 entry matches your family but ages 10 yrs out.
Robert Bell married Ann Coaton 16th March 1873 St Peters Dale End Birmingham
Name Relation Marital Status Gender Age Birthplace Occupation Disability
Robert BELL Head M Male 28 Birmingham, Warwick, England Brass Caster
Ann BELL Wife M Female 28 Birmingham, Warwick, England
Ann M. BELL Daur Female 7 Birmingham, Warwick, England Scholar
Robert M. BELL Son Male 6 Birmingham, Warwick, England Scholar
Esther BELL Daur Female 3 Birmingham, Warwick, England Scholar
John BELL Son Male 3 m Birmingham, Warwick, England
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Source Information:
Dwelling 5 House 5 Court Vauxhall Road
Census Place Aston, Warwick, England
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Esther Bell married James richardson 1900 entry for James and Esther in Aston 1900.