Neither Comedy Central nor The Colbert Report have made an official announcement explaining why the popular satirical comedy show abruptly suspended production this week. People with tickets to Wednesday night's taping received an email saying, "Due to unforeseen circumstances, we have cancelled our taping for the date of your ticket reservation, February 15, 2012." Now a source close to the show says production was halted because of Colbert's ailing 91-year-old mother Lorna Colbert.

"They are a very private family," the unidentified source tells the Post. "It’s not surprising that he did not want anyone to know what was going on.” Colbert, the youngest of 11 children, is very close to his mother, says the source. When he was ten, Colbert's father and two older brothers died in an airplane crash, leaving Colbert's mother to raise the family herself. Colbert is said to have an "especially tight relationship" with his mother. Her condition is currently unknown.

Here's a photo retrospective of the Colbert family, with photos of Colbert's mother Lorna, her late husband, and their children, plus take a look at this video of Lorna Colbert discussing Stephen: