Jennifer Lopez is “happy seeing the kids happy together,” a source tells PEOPLE amid the couple’s split

Jennifer Lopez attends the "Halftime" Premiere during the Tribeca Festival Opening Night on June 08, 2022 in New York City; American actor and filmmaker Ben Affleck arrives at the World Premiere Of Amazon Studios' And Skydance Media's 'Air' held at the Regency Village Theatre on March 27, 2023 in Westwood, Los Angeles, California, United States.

Jennifer Lopez and Ben Affleck are not romantically reconciling.

Despite having a friendly lunch with their kids over the weekend, “They are still moving forward with the divorce” and “working out financial details amicably,” a source tells PEOPLE.

“They all came together for a fun lunch so the kids could hang out,” the source adds of their gathering, which included Affleck’s two younger children Seraphina, 15, and Samuel, 12, plus Lopez’s 16-year-old twins Max and Emme.

The source says the group dined at the Polo Lounge inside the Beverly Hills Hotel in Los Angeles on Saturday, Sept. 14, less than a month after Lopez, 55, filed for divorce from Affleck, 52.

Jennifer Lopez Jennifer Lopez poses on the red carpet at the One&Only One Za'abeel Grand Opening ; Ben Affleck attends the world premiere of "Air"

Affleck’s 18-year-old daughter Violet, who recently left for college at Yale University in New Haven, Connecticut, was not in attendance at the lunch, but spent time in New York’s the Hamptons over the summer with Lopez.

Despite spending the summer on opposite coasts, Lopez and Affleck also came together multiple times to celebrate his kids in the months ahead of Lopez’s Aug. 20 divorce filing, including for Violet and Samuel’s graduations.

The source tells PEOPLE that “a divorce is never easy,” and “the kids always got along and have fun together. It makes [Lopez] happy seeing the kids happy together. Happy kids are her priority.”

Ben Affleck and Jennifer Lopez at the 81st Golden Globe Awards held at the Beverly Hilton Hotel on January 7, 2024

Lopez recently returned from a trip to the Toronto International Film Festival, where she made her first public appearance since her divorce filing at the premiere of Unstoppable on Sept. 6.

A source told PEOPLE at the time that the actress and singer “was happy to be in the spotlight again because of work.”

“She’s so over all the attention on her personal life,” that source added. “The film festival truly uplifted her. She was excited to focus on work again.”

While Affleck and his longtime friend and Artists Equity production company co-founder Matt Damon also served as producers on the true-story sports drama, Affleck did not attend the premiere.