Kelly Clarkson and ex-husband Brandon Blackstock “changed their perspectives” on life after their bitter divorce during his three-year cancer battle.

“Co-parenting was not easy for Kelly because she was the one who had to transport the kids, so it was really her life that was always turned upside down,” a source exclusively told Us Weekly on Friday, August 8, adding that Blackstock’s health diagnosis didn’t necessarily bring the former couple “closer together” but instead “changed their perspectives.”

“She is their [children’s] primary parent. But this was catastrophic for them, so immediately Kelly went into mom mode and focused on the kids and how they were coping,” the insider added.

Clarkson, 43, also made sure the pair’s two children, River Rose and Remington Alexander, “were with

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