A sister shares childhood memories and grown-up dreams. – Author Unknown

Sisters may share the same mother and father but appear to come from different families. – Author Unknown

Sibling relationships — and 80 percent of Americans have at least one — outlast marriages, survive the death of parents, resurface after quarrels that would sink any friendship. They flourish in a thousand incarnations of closeness and distance, warmth, loyalty and distrust. – Erica E. Goode, “The Secret World of Siblings,” U.S. News & Worl