Augustine Tovar - Seeking Family Information

Hi,
I'm trying to fill in some gaps in our line.I have Augustine Tovar who married Lucita de La Luz Keldaron.They had at least one son named Salvador Keldaron born abt 8 Aug 1928 in Mexico.I don't know if there are any brothers or sisters.Salvador married Angela Angulo.She was born abt 6 Nov 1925. She already had a son before she married Salvador.The son's name was David Angulo Lopez born 25 Jan 1952.When David turned 18 years old, he changed his last name to Tovar.We're unsure whether the stepfather Salvador Keldaron ever adopted David.If anyone might have any information that may be helpful, I'd be so grateful as I'm just starting research on this Tovar line - dates, names, places, Augustine Tovar's parents or family... anything would be so appreciated.Thank you for any help anyone might be able to give.