Timmothy Pitzen disappeared in May 2011 just days after his mother, Amy, signed him out of his kindergarten class without her husband, Jim’s, knowledge.

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Amy reportedly took the then 6-year-old to a zoo and two different water parks over a few days before checking into a Rockford, Illinois motel alone. Authorities say Amy wrote a note saying that Timmothy was “safe” and that he would never be found. Then she took her life. Timmothy has never been 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 Amy, who was on her fourth marriage at the time of her death, had endured a difficult past.

“I think that she was hurt by my father. She was hurt that she felt like her and Jim were having problems – she didn’t know where it was going to go – so I think suicide was the ultimate ‘Forget you’ and doing what she did with Tim was also a punishment.”

Kara and Jim both say they believe that Timmothy is still alive. Does Dr. Phil say he agrees?

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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).