Toby, who was drafted by the Twins in the 41st round of the 2005 First-Year Player Draft, was promoted to Triple-A Rochester on Sunday.
"I'm happy for him, excited for him, pumped -- that's a huge step," Gardenhire said. "He works very hard and he's a good kid. He can do a lot of things on a baseball field."
Gardenhire heard about his son's promotion not from the organization, but rather from his wife, Carol.
"Kind of out of the blue," he said jokingly of the unexpected notification. "I didn't know anything about it and still haven't received any calls from anybody in the organization other than my wife."
Despite being the son of a Major Leage manager, Gardenhire said Toby is "just like every other player."
"You have to be in the right place at the right time and you have to be doing well," Gardenhire said about making it to the show. "Somebody has to say this kid deserves to go to the big leagues. It can't be me. I'm up here and they're the ones down there. I don't control any of that."
Over three seasons with Double-A New Britain, Toby hit a collective .257 with 43 RBIs. He will round out a trio of catchers at Rochester, including Jose Morales and Wilson Ramos.
What else did Gardenhire have to say about his son's promotion?
"It makes me think he may have got a raise going to Triple-A, so he can pay me back money."