Dear Sofia, You may probably note that the records you are looking through
are pretty consistent, in that they all probably don't have grandparents
listed for that period of time by that scribe. Its wonderful when they are
full of info (I love it that many of my marriage records from Guanajuato
include the groom's profession), but that just isn't always the case. This
may reflect cost-cutting measures at the time, ie less paper, ink. I haven't
come across any of my own ancestors originating in Spain yet, but I have seen
entries that include mention of an originating city in Spain. I don't know how
common this is.

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