This kanji 頭 what does it mean in this sentence?
I looked up the meaning of かしら and still don't understand the meaning of the whole sentence. Please help translate.
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「かしら」 here means the "first one on the list". In the context of the siblings, it refers to the oldest child.
"With a 20-year-old (at the top/as the oldest), we have three boys in our family."