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Around the time Arnold is 11-12 Miles and Stella decides to adopt a parentless infant from the Green Eyed people. They name the child Phillipe Arnaldo Shortman. This would make a nice setup to parallel Helga and Olga’s relationship. Arnold would enjoy being an older brother, but because of the big age gap as Phillipe grows older, they start to drift apart. Arnold would come to Helga (and Gerald but Helga would better understand the specific situation better because of the age) for advice on how to be a better older brother to Phillipe and Helga and Phillipe would bond about their annoyance of their “perfect older siblings”. Helga and Phillipe’s will eventually have a sibling-like bond that she could really use while Arnold is away for college in a different state.