Kelly Clarkson 's grief for her children after the death of their father has been intensified due to her relationship with her own dad, RadarOnline.com can report.

The loss of Clarkson's ex-husband Brandon Blackstock has left her "devastated" for daughter River, 11, and son Remington, 9. Article continues below advertisement

Clarkson and her ex had a messy divorce , leading to a lengthy legal battle. Yet Clarkson, 43, never shared negative remarks with the kids about Blackstock, who died last week at age 48 after a three-year battle with cancer .

Those close to the inaugural American Idol winner said she kept Blackstock an active part of their lives after the split and didn't want her kids to have a relationship sadly similar to the one she has with her own dad.

"They a

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