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.
「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."