Kelly Clarkson's ex husband and father of her two children, Brandon Blackstock, has died, and the family's loss makes their last Instagram posts even sadder.

She always wanted her kids to have the best relationship possible with their dad,” a source told People on Thursday.

Kelly Clarkson is mourning the death of her ex-husband, Brandon Blackstock. The talent manager — whose family was pivotal in her career — died at the age of 48 after a private cancer battle.