There is a Palacios family that originated in the Monterrey, N.L. area that come to the lower Rio Grande Valley in South Texas. Many of us tie in to that family.
I searched for Toribio Palacios in the family search site:
http://www.pilot.familysearch.org and found a Toribio Palacios from Leon, Guanajuato. His father is listed as Felipe Palacios. He died in Edinburg, Tx. The informant was Felipe Palacios. He died July 7, 1964. Date of Birth: April 13, 1886.
I would suggest you search the McAllen newspaper for a death notice. Also check Univ of Texas, Pan American for their website. Perhaps they will do the search for you for a minimal fee. McAllen, Texas is the largest city near Edinburg.
Also, contact any of the aunts or uncles that may be living. They are a great source. Good luck. Let us know how you are doing,
If the children were born in the lower Rio Grande Valley, they may be registered in Roma, Rio Grande City, or Brownsville, Tx. The Catholic Archives in Austin, Tx can do a search for you for a small fee.