Jose Tomas Guerra Cañamar was born circa 1757, the son of Francisco Guerra and Ana Josefa de la Garza.
He married Maria Rosalia Hinojosa on 6 Aug 1794.
In 1782, he lived in Mier. The church census recorded that he was single, español, and 25 years old. His household included 8 people:
Don Francisco Antonio Guerra Cañamar, español, married, age 72. He owned Rancho Junta de los Rios but did not live there.
Doña Ana Josefa de la Garza, española, married, age 60.
Maria Leonor Guerra Cañamar, española, an unmarried girl, age 42.
Jose Tomas Guerra Cañamar, español, single, age 25.
Maria de los Santos Guerra Cañamar, española, an unmarried girl, age 22.
Jose Silverio Guerra Cañamar, español, single, age 21.
Lucia Guerra, casta, an unmarried girl, age 20.
Julian Guerra, casta, a youth, age 14.