In Assassin's Creed Brotherhood, what is the name of Ezio Auditore's sister?

Ezio Auditore's sister is Claudia Auditore in Assassin's Creed Brotherhood.

Claudia is introduced in Assassin's Creed II as one of Ezio's younger siblings and becomes a more active character in Brotherhood. After the Auditore family loses its wealth and home, she helps manage the rebuilding of the family and later supports Ezio's efforts in Rome.

In Brotherhood, Claudia can become the head of the Assassin Bureau in Rome. This development reflects the game's larger focus on rebuilding the Brotherhood rather than treating Ezio as a lone operative. Her leadership role is linked to missions and upgrades that improve the organization based in the city.

Claudia is not the same character as Maria Auditore, who is Ezio's mother. Cristina Vespucci is a Florentine woman connected to Ezio's youth, while Sofia Sartor appears later in Assassin's Creed: Revelations. These names belong to different relationships in Ezio's life, making Claudia the specific answer for his sister.