"Katherine is very upset and emotional. She's barely able to speak ," a family insider told RadarOnline.com. "No one can calm her down."
Now, as the family copes with the loss of the 89-year-old patriarch, RadarOnline.com has learned that they are all "extremely concerned" for Joe's 88-year-old wife.
"Everyone is very worried that this is going to send her over the edge, being she recently had a debilitating stroke," a separate source said. "No one believes that she is going to last long without him."
Her kids are now "sticking by her side" to make sure her health doesn't deteriorate to the point of no return, the source assured.
Joe died from an aggressive form of cancer, which was first reported by The National ENQUIRER in 2017.
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As RadarOnline.com previously reported, there will be a private viewing for the music manager in Los Angeles within the next two days.
The iconic father of the late King of Pop Michael Jackson is survived by Katherine and their ten children.
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