Although someone else in your family may have experienced the same event or person in your memoir entirely differently, this is your memory, your truth and your experience. My brother remembers our mother as being weak and frightened. I remember her as being strong and brave. Perceptions are complicated and personal and singular, and the more your respect your own unique insight, the more fun you'll have writing and the more your memoir will come to life on the page.
The writer and teacher, Brenda Ueland, says that you must write from your true self and not from the self you—or others—think you should. No individual is exactly like any other individual.
No two identical persons have ever existed—including twins. Therefore, if you tell the truth and speak from your true self, you cannot help having something important, unique and interesting to say that will be treasured for generations to come.