I loved the Berenstain Bears too. My mother taught elementary school and had the whole series, even way back to when Brother Bear was an only child, named "Small Bear." He apparently had to undergo a name change when Sister Bear came along. I guess his parents weren't too forward-thinking... or Sis was an "oops."
(I wonder how the Star Wars
franchise would've changed if Han Solo discovered he had a long-lost sibling? Obviously he wouldn't be solo anymore.)