Calvillo, Aguascalientes church records have me believing that they may be the same person. The names Merced Medina and Merced Macias come up in records naming her as a parent or grandparent. In some records she is called by Medina in another record Macias. I have been unable to clear up the relationship. I only have my suspicions.
Concider these conflicting entries.
Matrimony of Diego Serna and Marcela Lopez , June 11 1829
Diegos parents Juan Manuel Serna and Merced Macias
Diegos' and Marcela childrens entries of Grandparents are as follows
child                             Grandparents names
YSIDRO b. 03 Apr 1830              Juan Cerna and Merced Macias
JACINTO b. 15 Aug 1831             Juan Cerna and Merced Macias
SOTERA  b. 21 Apr 1833             Juan Cerna and Merced Macias
Clemencia b. 22 Nov 1835           Juan Cerna and Merced Medina
Ysabel b. 02 Jul 1837              Juan Cerna and Merced Medina
Juana b. 23 Jun 1839               No entry
Jacinta b. 16 Aug 1841             Juan Cerda and Merced Medina
Siriaca b. 17 Jun 1843             Juan Cerda and Merced Masias
J. Refugio b. 01 Jun 1845          Juan Serda and Merced Medina
Manl. Adrian b. 08 Sep 1847        Juan Serna and Merced Masias
Bruno b. 09 Oct 1849               Juan Serna and Merced Masias
Nasario b. 26 Jul 1852       Juan Manl. Serna and Marcela Lopez , I am thinking this Marcela Lopez is a clarical Error as Marcela Lopes is the Mother not the grandmother. 
Jose Manuel Serna and Trinidad Aguilera childrens entries of Grandparents  are
child                                     Grandparents
Crecensio b. 29 Dec 1805           Juan Serna and Merced Macias
Anto. Gil  b. 01 Sep 1813   Juan Manuel Serda and Maria Merced
Manl.   b. 15 Jun 1826             Juan Cerna and Merced Medina
IN the marriage of Casimiro Saucedo and Anastacia de los Dolores Serda m. 03 Feb 1799 . Anastacias's parents are Manuel Serda and Ma. Merced Macias.
In the decendants of Matias Serna and Juana Esparsa
    child                                        Grandparents
Jose Anto. b.  04 Aug 1814        Juan Manuel Serda and Merced Medina
Jose Pablo b. 07 Jun 1826                Juan Cerna and Merced Medina
The Serna, Serda , Cerna , Cerda variations dont bother me .. its the confusion of Maria Merced and Maria Medina . I need some clarifying information. Thanks in Advance. my contact info is Mooskies4 at aol dot com
