Nicolas Macias Valadez and Joseph de Valderrama

I have just read the entry in the book "Sagrada Mitra de Guadalajara" (p. 336, #1769) for the dispensation of Sebastian de Chavez and Maria Gertrudis Macias, for 3rd degree consanguinity. The record is dated 27 Sep 1754, Mezquital del Oro, Zacatecas. The dispensation was apparently granted 25 Feb 1746.

If I have read the entry correctly, Sebastian de Chavez is the grandson of Joseph de Valderrama (his wife is not named). Maria Gertrudis Macias is the granddaughter of Nicolas Macias Valadez. Nicolas Macias Valadez and Joseph de Valderrama are brothers, but Nicolas is from the first wife and Joseph from the second wife of their unnamed father.

Nicolas's wife is named; she is Juana de Anda. Are they the Nicolas Macias and Juana de Anda who were married in Santa Maria de los Lagos, Lagos de Moreno, on 16 Sep 1680?

I can find baptisms for several children for Nicolas and Juana, but not the son (Juan) who is the father of Maria Gertrudis.

I can find little information on the Valderramas: I have the marriage date for Sebastian's mother Tomasa de Valderrama and Phelipe de Chavez (casados: 7 Nov 1708 and velados: 8 Apr 1709), but nothing else.

Who is the father of Nicolas and Joseph, and who are their mothers?

Any assistance would be appreciated.

George Fulton