Timmothy Pitzen has been missing since May 2011. The then 6-year-old’s father, Jim, says there was “nothing out of the ordinary” the day his wife, Timmothy’s mother, Amy, signed their son out of school and took him on a trip from which neither returned.

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Amy Pitzen was found dead by her own hand in a Rockford, Illinois motel room a few days after she and Timmothy left home, but authorities say there was no sign that the 6-year-old had ever been there. In a note she left behind, Amy wrote that Timmothy was “safe” and that he’d never be found.

WATCH Dad Of Missing Timmothy Pitzen Says Wife’s Behavior ‘Didn’t Seem Like Anything Out Of The Ordinary,’ The Day She Left With Their Son

Amy’s sister, Kara, says she was “a little surprised” when she heard that Amy had gone missing and taken Timmothy with her, but claims that “Amy has had some erratic behavior before.”

When Dr. Phil asks whether she ever thought her sister could take Timmothy away from his family and give him to someone else, Kara responds, “I couldn’t have even come up with this in my wildest dreams.”

Kara says she doesn’t believe that Amy would ever have physically hurt her son. Does Dr. Phil agree?

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If you or someone you know has any information regarding Timmothy Pitzen, his disappearance, or where he might be today, please contact The National Center for Missing and Exploited Children. Visit online or call 1-800-THE-LOST (1-800-843-5678).