Hi
This seems to be them, courtesy of FREECEN in 1841
Engine Street Bathgate.
William Todd aged 50 Grocer born West Lothian
Jessie Todd aged 15 born West Lothian
William Todd aged 13 born West Lothian
John Todd aged 7 born West Lothian.
No sign of Isabella, his wife, or children Robert and David.
This then appears to be the family in 1851.
Engine Street Bathgate.
William Tod aged 62, widower, born Livingston West Lothian, Occupation Labourer Grocer.
Janet Tod aged 28, daughter, unmarried, born Bathgate West Lothian, Occupation Shopkeeper.
William and John not showing in West Lothian in 1851.
Best wishes
Jean