Here is some information for you - I obtained it from my cousin in Ireland:
Louisa married Auguste Comte on 14.3.1833 in St. Pancras. They lived in Nantes and had 2 children in 1837/8. Her older sister, Mary Anne, married Thomas De La Hay in 1818 and lived in St. Omer. She seems to have been about 14 at the time as she was baptised on 8.1.1804! Catherine De La Hay must have been a relative, but it looks as if she was stepmother to Mary Anne who was much older than her!
Message du 18-08-2008