Sage Stallone, 36, died last month at his Los Angeles home. The cause of death has yet to be determined.
Sitting with his “Expendables 2” co-stars, Stallone told ABC News reporter Cecilia Vega, "It's tough. It's very tough… it's a horrible situation."
Watch the interview.
Sylvester said, "Time, hopefully, will heal, and you try to get through it, but it's just something. It's a reality of life. I think it's important to get back and start reliving your life. Otherwise, you can go into a spiral."
“The Expendables 2,” which also stars Arnold Schwarzenegger, Jason Statham, Dolph Lundgren and Jean-Claude Van Damme, blasts into theaters this Friday.