Cristobal and or Rodrigo Cristobal Olivares

I have recently bought and checked out several great books for my research on my paternal side. But, the latest book I bought has me questioning the help and information I have taken from previous books and online searches.
I am researching the couple Manuel Gomez and Catalina de Mendoza in los altos de Jalisco (Jalostotitlan). I have them as the parents of Juana Gomez de Mendoza, who was married to Domingo Lomelin. Anyway, I originally had Catalina's father and mother as Rodrigo Olivares and Maria Hurtado de Mendoza. Quite a few books seem to point in that direction. However, if I am reading it correctly, this newer book seems to say that Catalina's parents were actually Cristobal Olivares and Mariana (Maria) de Mendoza. AND that the Maria de Mendoza that was married to Rodrigo de Olivares was actually A SISTER of the Catalina de Mendoza.
If I am reading it correctly, the author of this second edition mentions that he too also believed that Rodrigo de Olivares and Maria Hurtado de Mendoza were the parents of Francisca Hurtado de Mendoza (who is another SISTER of Catalina), married to Francisco Gutierrez Rubio,
so that would have made them Catalina's parents too. BUT after being presented with a testimony located in San Luis Potosi, he now believes that Francisca's (and therefore Catalina's parents) are Cristobal Olivares and Mariana (Maria) de Mendoza.
Has anyone else come across this issue?
Sandra