Ben Affleck's Mom Is Staying with Jennifer Garner As Actor Continues Rehab Treatment

(Photo: Pascal Le Segretain/Getty; Axelle/Bauer-Griffin/FilmMagic)
(Photo: Pascal Le Segretain/Getty; Axelle/Bauer-Griffin/FilmMagic)

By Ale Russian

Jennifer Garner and her three kids have a special person visiting them at home — Grandma Affleck!

Ben Affleck’s mom Chris has been staying with Garner and her three grandkids — Violet, 12, Seraphina, 9 and Samuel, 6 — as Affleck, 46, continues seeking treatment at a rehab facility in Malibu. Garner and Chris Affleck were spotted together with the kids heading to church on Sunday.

A source tells PEOPLE that Chris Affleck is spending time with Garner, 46, as she promotes her new movie Peppermint, which was released in theaters last week.

“Jen has been super busy promoting her movie, and getting the kids settled back in school,” the source says. “She seems great. She has been very excited and proud to promote her new movie. The kids are excited to be back in school.”

WATCH: Inside Ben Affleck’s Battle with Addiction — and How Jennifer Garner Has Helped Him

Although the couple announced their separation in June 2015 and filed for divorce in April 2017, on Aug. 22, it was Garner who drove Affleck to a Malibu treatment center when it became clear he was drinking again and needed help.

RELATED: Inside Jennifer Garner’s Fight to Help Ben Affleck: It’s ‘Been Very Stressful for Her’

When it comes to talking to her children about their father’s addiction issues an insider told PEOPLE, “there are no secrets, and Jen is great at explaining what’s going on in ­age-appropriate ways.”

“She tells them Ben is sick and needs doctors,” the source continued. “What she ultimately cares about is his sobriety and whether she can rely on him to co-parent.”