By Debbie Emery - Breaking Celebrity News Reporter

Susan Powell’s grieving parents are considering taken legal action against Washington state authorities over the child custody case that led to the death of their grandsons at the hands of their father, but Breaking Celebrity News can exclusively reveal that other family members believe that the only person to blame for the tragedy is Josh Powell himself.

“I haven’t heard anything about a lawsuit yet and they (Chuck and Judy Cox) haven't said anything to me about it,” Powell’s brother-in-law Kirk Graves told Breaking Celebrity News in an exclusive interview.

“I can say that based on the information I have, if I was in their situation then I wouldn't file a lawsuit.

“If there was someone at fault it was Josh, and there was no one else at fault in my mind,” revealed Graves, who is married to Jennifer Powell, Josh’s sister, but the couple remain incredibly close to Susan’s family and are their strong and loyal supporters in light of both tragedies.

On Monday, Chuck Cox, Susan’s father, told FOX 13 that there were no immediate plans for a lawsuit and it was too premature to talk about legal action. "Right now, we need to figure out exactly where the blame lays," he said.

"There's a lot of questions about how the authorities could have allowed visitation, knowing what they knew about Josh," he added.

As Breaking Celebrity News previously reported, Powell was the prime suspect in the 2009 disappearance of his wife, Susan, when he attacked his two sons, Charlie, 7, and Braden, 5, with a hatchet on February 5 and then blew up the house, killing all three of them in the explosion