Whenever my sister and I are staying at home in New York with our parents, our mother doesn't like waking up in the middle of the night and not knowing if we've returned after being out late. The 'Are my kids home yet?' system was developed to solve that problem by providing an easy indication if we've returned and are at home in bed.
This problem was chosen because I know my mom worries when she wakes up in the middle of the night and can't tell if we've returned or not.
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