I fear that not everyone has good sisters. I know a sister (not mine) that is
conniving, spiteful, petty, shallow, and snobbish. She is awful.
The nicer one (see my post in
platonic erotic massage) was
wonderful, nothing like her
sister. She loved her sister, but couldn't spend any time with her. "I love you like a sister" to her would mean that you want to take something from her.
Families can suck, too.