"I don't give my kids a chance to pick sides," Affleck told ET's Jennifer Peros at the massive Dawn of Justice premiere at Radio City Music Hall in New York City on Sunday. "They're Batman's kids so they gotta be on Batman's side. Otherwise there's no supper!"
Although it seems the 43-year-old star's three kids -- Violet, 10, Seraphina, 7, and Samuel, 4 -- whom he shares with his ex, Jennifer Garner, don't need to be convinced. They think their dad's pretty cool now that he's playing the iconic caped crusader.
Although Affleck says he doesn't think the cool factor is going to last much longer.
"I think, give them a year or two and they'll be completely embarrassed by me," Affleck joked. "By the time Justice League comes out, maybe, they'll be embarrassed of me."
The two-time Oscar winner also addressed speculation that he had built his own Batcave in his home.
"That's not true, it's just that my son thinks I go to the Batcave when I go out to work," Affleck explained. "So when I come home, he's like, 'Dad, were you at the Batcave?' And I'm like, 'You got it kid, Batcave! You know how it is, I had to go to the Batcave.'"
As for the rumor that he re-wrote some of the Dawn of Justice script while dressed head-to-toe in his Batman costume? Yeah, that apparently didn't happen either.