los Rubalcava-Gallardo de San Juan de los Lagos, circa 1715-1725

Dear Primos:
i am stuck here, with the Rubalcava-Gallardo Family. i have Four [4] Baptismal Records, All from Lagos de San Juan & from Family Search. their Parents were: Francisco Rubalcava & Elena Gallardo. those Baptismal Records, of that era, Do Not mention the Grand-Parents. i am a descendant of Ma. Trinidad Velis-Rubalcava. i do have the Retoños Book, all Volumes, & believe it or not, this linage, are not mentioned.! when i saw that Ma. Trini was a Rubalcava, i went: that'za easy one.! Wrong. searched of course, the González de Rubalcava first & went through every variation, of that surname, to no avail. cannot find anything either, on this mysterious Elena Gallardo.? no Marriage Record, nothing. Their son: Joachin Vicente, is my Ancestor, Ma. Trini's Abuelo Materno. it is mentioned, in the Rubalcava Section of the Retoños Book, that "two offspring of unknown name, mentioned by his grandmother, Doña Beatriz López de Fuenllana; in her will, cited in the González de Rubalcava chapter." am wondering if this Francisco, is one of those children.? Any information, would be greatly appreciated. johann