There seems to be a contradiction or error in the category of Breeders under Verdier, Philippe-Victor. The information states that Charles is the younger son (born 1824) and Eugene the elder (born 1827). Either the birth dates are incorrect or the sequence of siblings is incorrect. But Eugene is also called " fils aine", meaning the elder sibling. Also under "Verdier fils aine, Eugene," he is stated to be the elder son but born in 1827. Since several of the quoted sources also state that Eugene is the eldest, the birth dates for one or both brothers seems incorrect.