How do we learn our roles in life? Is it possible that an older sister helps mold a younger brother? How about the following--
Growing up and learning to read in the 1950's, I recall that my older sister (by three years) helped me learn to read by using comic books. She would open a comic book and proceed to instruct. Not only did she help me learn to read, but I probabaly learned my proper role in life (as a male). I recall that she picked which comic books to "read" to me.
Could it be that an older sister assumes the superior role as a "Little Lulu" while the younger brother is merely a "Tubby"? That the sister is the smart "Nancy" while the brother is born to be a perfect "Sluggo"?
And how about this-- are these learned "inferior" male roles assumed and held over into adult relationships? Why does Charlie Brown continue to trust-- yet be fooled-- by Lucy? It's probably no accident.
Maybe that's a little cynical. Perhaps younger brothers learned something about proper relationships from such role models as "Popeye" (a befuddled vagabond sailor) or "Lil' Abner" (an uneducated hillbilly).
These comic book characters probably taught a lot.