In Game Bio:
Date of Birth: 1463.
Profession: Student, Noble.
The youngest of the Auditore children, Petruccio was described as "having a weak constitution" by Giovanni Auditore in a letter to Lorenzo de' Medici soon after the boy's birth.
Apparently, he didn't improve with time. Petruccio was pulled from school due to illness when he was 12 and, according to records from the family doctor, was confined to bed. No other data exists after that, so it is probable that he eventually succumbed to his illness.