BARDSTOWN, Ky. (WHAS11) –The search for a missing mother of 5 continues a week after her disappearance.

Crystal Rogers' sister Brooke Ballard is speaking out after her car was found on the side of the Bluegrass Parkway with keys, purse and cell phone still inside.

Ballard says she's concerned that Crystal's boyfriend, Brooks Houck, may know something and questions his claims that Rogers stayed up late on July 4 and when he woke up, she was gone.

"The stories don't add up. You don't go to bed one night [and] not know she's gone and not worry she left the baby," she said. "He has not offered once to search, or help, or do anything for the family.

Authorities say Houck has been cooperative in the investigation.

Earlier during the week, he made an appearance on HLN's Nancy Grace to defend himself.

Houck's polygraph was inconclusive and the family is now urging him to take it again to help them get answers.