Believe he married twice :
1st wife
1- Rosalia Merlopes ... and at her death
2- married her sister Gertrudis.
Maria Rosalia Merlopes
Abt. 1776-1849
Gertrudis Merlopes
Note: Once book states that Rosalia had a SISTER named Gertrudis Merlopes whom Jose Antonio Robles married after Rosalia's death.
SANTA CRUZ COUNTY:
... Among the passengers on the Concepcion were three men who became alcaldes. ... Jose Antonio Robles, who married first Rosalia Merlopes and at her death her sister, Gertrudis, and reared several children, held a number of offices before becoming alcalde in 1841; .
Historic Spots in California, Stanford University Press, 1990 - California - 617 pages, page 424
SANTA CRUZ COUNTY
...  Among the passengers on the Concepcion were three men who became alcaldes. ... Jose Antonio Robles, who married first Rosalia Merlopes and at her death her sister, Gertrudis, and reared several children, held a number of offices before becoming alcalde in 1841; ...
http://books.google.com/books?id=p2WrAAAAIAAJ&pg=PA424&lpg=...