Jack Byrnes is a former CIA agent that retired under the disguise of a florist. In Meet the Parents, Gaylord "Greg" Focker tries desperately to impress Jack so that he may ask for his daughter, Pam's hand in marriage. However, Jack does not trust Greg and uses his CIA techniques to investigate this murse.
In Meet the Fockers, Jack drives an RV with his family and Greg to meet Greg's parents, the Fockers.
Greg Focker: You meet some of the... eh... some of the cousins? Jack Byrnes: I met some, yes. I met some... Dom? Greg Focker: Yeah, Dom Focker, that's my dad's... uh... first cousin. You meet his kids, Randy and Orny?