Maria Tomasa Bazan was the daughter of Jose Antonio Bazan and Maria Antonia Margarita Vela.
In 1782, she lived in Mier. The church census recorded that she was a child, española. Her household included 5 people:
Jose Antonio Bazan, casta, married.
Maria Antonia Margarita Vela, española, married.
Jose Novento Bazan, español, married.
Maria Tomasa Bazan, española, a child.
Jose Angel Bazan, español, a young child.