John,
I think it''s the other way around, a dummy like me wrote it so it is difficult to comprehend. Here goes a second try. First is Juan's direct line ancestry on his father's side followed by his mother's direct line ancestry. Hilario Jauregui and Ma Concepcion Olasava are the common ancestor for both his paternal and maternal direct line ancestry.
1st Generation: my husband, Juan Carrillo, Juan is the son of Antonio Carrillo Jauregui and Maria Guadalupe Olmos Avelar
2nd Generation: Antonio Carrillo Jauregui married Maria Guadalupe Olmos Avelar. and is the son of Mariana Jauregui Olmos
3rd Generation: Mariana Jauregui Olmos, mother of Antonio Carrillo and daughter of Francisco Jauregui, Olasava
4th Generation: Francisco Jauregui Olasava, father of Mariana Jauregui and son of Hilario Jauregui
and Ma Concepcion Olasava
4th Generation: Hilario Jauregui marries Maria Concepcion Olasava, they have 7 children, one of which is Francisco Jauregui and the other relevant