"You told me that when I debuted, I would debut as your partner," Dominic Gutierrez said. "... Stay in WWE. Don't retire. I'm going to make you proud."
According to Wrestling Observer (h/t Paul Davis of Wrestling News), WWE is interested in signing Dominic to a contract, although he might not be ready for in-ring action until 2020.
Mysterio—who signed a two-year deal last September—decided the prospect of wrestling alongside his son was enough to continue his career for at least a little longer.
The 44-year-old has been one of the biggest stars in wrestling over the past three decades in a variety of different organizations. He has continued to make an impact in the ring, winning the United States Championship earlier this year.