I was thinking about the pick up form, where he was apparently listed as a family member. When I fill those forms out for my children, I usually have an extra blank spot for additional family, as it's really just me and my children. I sign it, give it to them, and they turn it in. It wouldn't be difficult for them to mimic my handwriting and add an additional person to that blank spot and turn it in, with my true signature on it. Thus could be what happened. And I will be more aware with our school forms for now on!
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