Do you have any given names, time frames and bits of information about the family? Any mention of places besides Nice? Anything will help with the search.
Are they related to the Tortarolo's in any way? I ask because so far I've only been able to find one Vitran in Nice in the 1913-1922 birth table: Magalie Marie Therese Vitran born 30 March 1919. She has the same given names and birthday as Magalie Tortarolo. Magalie Tortarolo's entry in the same birth table says "6 March 1920 (JugetRect)". I'm not sure of the translation for JugetRect but it's some sort of official correction notation. Did the Tortarolo's adopt Magalie? I have requested the details of the Vitran entry from Nice and will let you know what they tell me.
Cheers,
Soosi