"He's very good," Grigorieva tells PEOPLE, of Dalton, 66, who is the father of Grigorieva's 12-year-old son, Alexander.
Dalton was seen Friday morning stopping by the Russian singer's Sherman Oaks residence, which is owned by Mel Gibson.
"We raise our son together," Grigorieva said Friday. "He's a good father and they have a very good relationship."
As for how she's faring in the midst of her public wrangling with Gibson, the 40-year-old mother says she and daughter Lucia, 9 months, are both doing "okay."
Grigorieva also insists she didn't release the explosive alleged taped conversations with Gibson or the photo of herself with broken teeth.
"I didn't release anything and I'm not happy with the lies being spread," she says. "But when the court is done with the investigation, then I'll be able to talk."