Val chimed in, noting that he's seen a great change in Maks ever since becoming a father.
"Our relationship hasn't changed. [Maks] loves me. But, for the majority of his life, I've been his baby," Val dished. "I've been his -- I am his best friend, I'm the love of his life. That's the truth."
"We have a great relationship," he added. "I've always been Maks' main dude, you know, and you can see just how Shai is ultimately the apple to his eye. He is his priority. He's the only thing he thinks about, and the person -- he becomes alive when he's around his son, so, it's awesome."
Prior to our interview, the full list of contestants vying for the season 24 mirror ball trophy was announced on Good Morning America. Maksim will be paired with Glee star Heather Morris, while his brother (who led Laurie Hernandez to victory last season!) will train Fifth Harmony's Normani Kordei. Peta is also making her return to the dance competition show with Nick Viall from The Bachelor.
Maks joked to ET that he already has plans to use Shai to rack up fan votes.
"[Peta and I will] totally use the baby for the votes," he said. "I told her, I said, 'Listen, I get the dibs,' because she gets the sympathy, with like, a baby momma coming back. We just need something, yeah. If I have a sexy, what is it, little harness..."
"Val wants to use the baby for some self-promotion, too," he added. "So, it's not weird."
But Val might have to put in some work before Peta or Maks allow him to do that. According to Maks, Uncle Val has yet to change baby Chmerkovskiy's diaper!
"Not even one attempt, like, hey, maybe, you know, I want to change something, just to be part of the family," Maks joked. "No, not even a little bit."
"I'm definitely an absentee uncle," Val admitted. "But you know, we're gonna be homies one day and he's gonna be mad at me. How dare you see me in that situation? So vulnerable. I'm just trying to save that. I don't want to ruin our future friendship."
All jokes aside, Val is stoked that his brother and future sister-in-law are able to compete this season.
"I'm excited," he gushed. "I'm excited for Maks, Peta. You know, just having a kid kind of puts everything into perspective. And I'm excited to see his new energy on the show, because you know, it's -- he's got other things more important to worry about. He can finally come on the show and enjoy the process."