In "Desiree's Baby", do you think Armand already knew about his black ancestory?

The last
lines of the story reveal that Armand did not know of his black
ancestry.

"But above all," she wrote, "night
and day, I thank the good God for having so arranged our lives that our dear Armand will never
know that his mother, who adores him, belongs to the race that is cursed with the brand of
slavery." (Chopin)

A very prejudiced man, Armand does
not know that he is the one who bears black ancestry from his own mother.  He would behave
differently looking at his baby if he knew the origins of the black features were from his side
of the family.