October 27, 2016 03:36 PM

Alexis Arquette was honored at an intimate gathering Wednesday night.

A source tells PEOPLE a memorial was held at the California Science Center in Los Angeles for the late actress, who had been living with HIV for 29 years before dying of cardiac arrest on Sept. 11 at age 47.

According to the insider, all four of Alexis’ siblings — David, Rosanna, Richmond and Patricia — were present, as well as other family and close friends.

“The memorial was rather beautiful,” says the source. “It was a lovely celebration and gathering. Alexis was beautiful and so gifted.”

The source says Rosanna, 57, “produced and made an amazing film on Alexis’ film world.”

Amanda Edwards/WireImage
Amanda Edwards/WireImage

Rosanna, as well as David, 45, Richmond, 53, and Patricia, 48, all spoke at the memorial.

“They shared very loving memories and they shared home movies and photographs,” says the insider. “They are a very tight family, and it was so wonderful to see the unity amidst the many personalities in and around that family.”

Steve Granitz/WireImage
Steve Granitz/WireImage

PEOPLE previously reported that Alexis was was surrounded by her family when she passed away.

“She had been suffering for a long time. She was sick for years,” a source told PEOPLE at the time. “At one point, she wasn’t able to leave the house; she was in bad shape. … Everyone knew [her death] was imminent. It was a matter of time.”

“The whole family rallied around her,” added the source. “And in the end they were always there to support her.”

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