The former L.A. Laker is surrounded by family and friends as he remains in a coma after being found unconscious Tuesday afternoon
Credit: FK-Rol/

Lamar Odom‘s children have arrived in Las Vegas to be with their father as he fights for his life following a drug overdose on Tuesday night.

Destiny, 17, and Lamar Jr., 13 were accompanied by their mother Liza Morales as they arrived at McCarran International Airport on Wednesday night. A source tells PEOPLE that Khloé Kardashian had arranged for the children, their mother and Odom’s father Joe to travel from New York to Las Vegas to be with Odom. Morales and Odom were together for 10 years before ending their relationship in 2008.

Khloé’s big sister, Kourtney Kardashian, was also spotted in Las Vegas on Wednesday night after spending the day in Los Angeles looking after niece [LINK and daughter Penelope” “” “” “0” ] while the family supported Khloé at the hospital.

Kourtney was seen arriving at Sunrise Hospital where Khloé is refusing to leave her estranged husband’s side. Sources tell PEOPLE that Khloé has to make tough medical decisions for Odom.

Odom, 35, was found unconscious in a Nevada brothel on Tuesday afternoon. After being intubated at a local hospital, he was rushed to Sunrise Hospital in Vegas, where he remains in a coma. A source tells PEOPLE that doctors found cocaine and opiates in Odom’s system and that he has had “a couple strokes” in the hospital.

Although estranged, Khloé, 31, and Odom are not officially divorced, leaving Khloé in charge of making medical decisions for the former L.A. Lakers player, which a source says is “very stressful. She is lost.”

The Keeping Up with the Kardashians star’s sisters and mother have “dropped everything” to rally around her and Odom since he entered the hospital, a source says. Kris Jenner and Kim Kardashian West arrived at the hospital Tuesday night and PEOPLE has confirmed that Kendall Jenner cut short her trip to Shanghai’s Fashion Week to be with her family at the hospital.