He was born 29 Apr 1770. His father was Antonio Montalvo, and his mother was Maria Petra Salinas. His father owned Porción 54, Mier. In 1782, he lived in Las Jaras in household number 108. The church census recorded that he was a child, español. His household included 14 people.
He married Nestora (Nicolasa) Gonzalez, daughter of Ildefonso Gonzalez and Maria Luisa Saldivar on 1 Jan 1797. He was 27 years old.
He married Maria Juana Ramirez, daughter of Jose Miguel Ramirez Hinojosa and Maria Antonia Izaguirre on 7 Feb 1809. He was 39 years old. It was his second marriage. Her father owned Agua Nueva de Arriba grant, Jim Hogg County. His wife died on 13 Apr 1838.