We found the book about the Canary Islanders in Louisiana at the Barnes and Noble site, as I recall, and ordered it right over the internet. That was a couple of years ago, so hopefully they still have it.
My father was a Cavalero (Caballero) from Donaldsonville, and Marie Plaisance was his grandmother on his father's side. Dad's mother was Lucy Sanchez, daughter of John Sanchez and Leonise Fernandez Sanchez.
I'm sure your husband and my dad had to have some common ancestors.
We think our John Sanchez may have been the son of Andres Tito Sanchez but we are having a lot of difficulty trying to find any records to substantiate exactly which family he belonged to. Since we are not in the state of Louisiana we don't have access to any of the diocese or parish records not on the internet. Would appreciate any insights.