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Chris Watts case: Shanann Watts' devastated parents weren't allowed to see granddaughters before they were buried

Frank Rzucek said in the interview that the bodies of the children were buried in bigger coffins that were sealed because they were flammable after being submerged in crude oil for four days before they were found

Shanann Watts' parents, Sandy and Frank Rzucek, opened up during an exclusive interview with Dr. Phil about how heartbroken they were when they could not see the bodies of their grandchildren before they were buried.

Frank said in the interview: "We got permission from [Watts'] side of the family to have the grandchildren and bury our grandchildren with their mom. But the hardest thing was flying them here because they were in crude oil for four days. So they were flammable. So we couldn't cremate them. They would have blown up a building."

The Daily Mail reported that the devastated grandfather continued: "They had to have a bigger coffin and then they had to seal it with a certain wrap, so the gasses wouldn't leak out. That's pretty sad, isn't it? So we three here never got to say good-bye to our family or see them."