"Traveling away from the family wasn ... Alongside a photo of his son on social media, he wrote, “we are heartbroken and have been managing as best we can.” Gary Sinise's Children: All ...

Sinise said in a message on the Gary Sinise Foundation's website that Mac died from cancer on Jan. 5, and was laid to rest on Jan. 23. "Like any family experiencing such a loss, we are heartbroken ...