A serious student of art, Andrée was passionate in her admiration of her father's work. As Yvonne lived in the States during the last 20 years of Dewis's life, Andrée was the artist's only child to witness the most important years of his career. She was so emotionally involved in his painting that one day Dewis wondered aloud whether his daughter would have loved him as much, "if I'd been a grocer." Years later, Andrée tearfully recalled assuring her father that she would.