Hello Cliff
Thanks for your response. I should have said I found the family in the 1841 census in Liverpool. I found her place of birth in the 1861 census and her maiden name in the IGI marriage record of John Cassidy & Deborah Curlett at St Nicholas's in Liverpool in 1826. I know her date of death as I have the certificate (1862) but, other than that, I know nothing of her.

Regards
Bill