11/03/2008 AT 6:50 PM ET
Jennifer Hudson kissed her mother goodbye at a private service for her slain family members in Chicago on Monday.
The Oscar-winning actress spent a few moments at the caskets of her brother and nephew, and gently touched the body of her mother before leaning down to kiss her, the Chicago Tribune reports.
Toward the end of the service, American Idol season 3 winner Fantasia Barrino sang a rousing rendition of the gospel classic “Your Grace and Mercy,” grasping Hudson’s hand.
As mourners including Oprah Winfrey, Queen Latifah and music producer Clive Davis left Chicago s Apostolic Church of God, Jennifer, 27, joined in the chorus of the recessional, “I Go to the Rock,” a longtime family friend told PEOPLE.
Chicago Mayor Richard Daley attended the service. After the funeral, a horse-drawn carriage led the procession to the cemetery.
The private service comes a day after a public service was held for Darnell Donerson, 57, Jason Hudson, 29, and Julian King, 7, at the Pleasant Gift Missionary Baptist Church near their Chicago home.
Police discovered the bodies of Hudson’s mother and brother on Oct. 24, and her nephew’s three days later.
Though no one has been charged, police have classified Jennifer’s brother-in-law, William Balfour, as “a person of interest.”
The Hudson family members will be buried at Oak Woods Cemetery on the South Side of Chicago.
Reporting by NIKITTA FOSTON