Channing and Roberts will return at the end of season four, reports Vulture.
© WENN / Andres Otero
Stockard Channing
© WENN / Joseph Marzullo
Dallas Roberts
Channing portrays Alicia's mother Veronica, while Roberts was cast as her little brother Owen.
Roberts revealed: "Owen's back for the weirdest reason. He's got some different ideas, and I'm finding that challenging and interesting.
"I can't go too crazy about what it might be, but, uh, yeah, suffice it to say when Owen pops up you're going to be surprised," he added.
Roberts also can be seen on The Walking Dead as Milton Mamet.
The Good Wife airs on Sundays at 9pm ET on CBS.
Watch a clip of The Good Wife below:
