TUCSON - In an exclusive interview with NBC's The Today Show Isabel Celis's mother, Rebecca Celis and father, Sergio Celis made another plea for the safe return of their missing 6-year-old daughter.

But they were also asked some hard questions.

Sergio Celis was asked what he thinks of the allegations that he may have had something to do with his daughter's disappearance.

His response, "Where do I begin?" Sergio went on to say it was extremely frustrating, and later in the interview said police were, "wasting time" focusing on him and his wife.

TODAY Show Exclusive: Interview with Rebecca and Sergio Celis

But Rebecca Celis had a different opinion. She said she understood that police had to question her and her husband, and do their job, and that she was willing to do go through whatever it took to get Isabel back home.

At the end of the interview, the couple profusely thanked everyone for well-wishes, and thanked the Tucson community for supporting search efforts.

And they asked that everyone continue to pray for their daughter - Isabel.