Boyd was born in Bedford, Texas. He currently lives in Los Angeles, California with his parents and actress sister, Jenna Boyd. Cayden plays the violin and cello, is on a football team, and is also a proud Christian. Cayden is more experienced in the acting world than most children his age. Growing up in Texas with his parents and sister Jenna Boyd he has been able to stay grounded and says, "My parents are a big help, and they're always making sure I have a normal life and my life isn't all just about acting and stuff."