Hi, Michelle.
Your father's paternal grandparents were Tomas Guadalupe Vaca (1878-1961) & Guadalupe Florence Salgado (1888-1970) who lived in San Luis Obispo county, California and had 11 children.
If you're interested in more detailed information, I can email you at the yahoo address that was connected with your original message. Just let me know.
--Alex. King