Regarding your request for information on LEOCADIO MONTANO and ZENAIDA NATIVIDAD SANCHEZ;Following is the information found.

LDS Microfilm Reel 017018,Taos Marriages,Page 463.1939 Feb 18 LAUCARIO (LEOCADIO) MONTANO de Arroyo Seco,Son of Jose Maria Montano Y Altagracia Tafoya,Baptised in Taos,NM 23 Oct 1868.With ZENAIDA (NATIVIDAD) SANCHEZ from Arroyo Seco,Taos,NM.Baptised 15 June 1896,Daughter of Vicente Sanchez and Sabina C. Casados.Testigos:Simon G.Martinez y Encarnacion L.Rael.By:Rev.Joseph M.Maguire. Couple married prior by Methodist Episcopal Minister Ca_ _lo Varos in Arroyo Seco,NM 6-10-09.

From The Book "Taos Marriages 1770-1860."By:David Salazar and Bill Trujillo. Published By The Genealogical Society Of Hispanic America-Southern Calif.Branch.
Frame 620.11 Oct 1858 JOSE MARIA MONTANO single son of Valentin Montano and Juaquina Bernal,Native of La Sonora,Resident of D.Fernando with MARIA DE ALTA GRACIA TAFOLLA,Single daughter of Jesus Maria Tafoya,Deceased and Maria Rita Gallegos,Native of Taos,resident of the same place.Sponsors:Miguel Martinez and Maria Jasinta Martines.Witness:Jose Rafael Tenorio and Pedro Valdes,residents of D.Fernando de Taos.

Same Source listed prior,Book Of Taos Marriages Taos M-40 (Box 37) 1833-1845,Frame 993.21 Nov 1837 JESUS MARIA TAFOYA con MARIA RITA GALLEGOS.Padrinos:Jose Tafoya Y Maria De La Luz Tafoya.Testigos:Jose Rafael Tenorio Y Juan Nicolas Duran,Todos Vecinos de San Fernando.

The book "Taos Baptisms 1701-1848."By:Thomas D.Martinez.Page 571.Has 2 entries which shows JESUS MARIA TAFOYA and MARIA RITA GALLEGOS as follows:

1-Maria Porfiria Tafoya Bapt 9-6-1838,2 days old,Father Jesus Maria Tafoya,Mother Maria Rita Gallegos,Vecinos de N.S.De Guadalupe (San Fernando).Paternal Grandparents:Jose Tafoya and Maria Francisca Bernal.Maternal Grandparents:Jose Pablo Gallegos and Maria Dolores Martinez.Padrinos:Jose Rafael Gallegos and Maria Josefa Tafoya.

2-Maria Leonor Tafoya Bapt 11-10-1843,7 days old.Pads:Henry Bonney and Maria Francisca Varela.

From The Book "Bautismos Our Lady Of Guadalupe Church de Taos 12 July 1887 to 27 December 1900.Page 92.

Sanchez,Natividad,Of Arroyo Seco Bapt 10 Jan 1891,Born 25 Dec 1890.Hija de Vicente Sanchez y Sabina Casado.Padrinos:Jose Francisco Duran y Guadalupe Sanchez.By:Off.A.J.Docher

Taos County Marriage Index Shows Vicente Sanchez and Sabina Casados Married 27 Oct 1884.

1910 CENSUS:Schedule 1-Inhabitants in Precinct 5,Arroyo Seco,County of Taos,Territory of New Mexico.9th and 10th day of May 1910.Fred Cordova,Enumerator.
228-230 MONTANO,Leocadio Head M W Age 37 Married Once 0 Years Stone Mason House
Natividad Wife F W Age 18 Married Once 0 Children Born

1920 CENSUS:Schedule 1-Inhabitants in Precinct # 5 Arroyo Seco,County of Taos,State of New Mexico.15th day of Jan 1920.Fred C.Trujillo,Enumerator.
112-113 MONTANO,Locadio Head M W Age 48 Married Laborer Farm
Natividad S. Wife F W Age 27 Married
Enocincio Son M W Age 6
Rafaelita Daughter F W Age 6/12