I've long admired Patricia Hampl's approach in I Could Tell You Stories. She discusses the lines she's crossed and what came of it. Mostly, she lost people in her life. I remember how angry one of my family members became when I wrote about my very religious grandmother's mugging and loss of faith in God because of it, her eventual death. "That's not the way it happened," this dear relative said. But it was the way it happened, from my experience. And I wrote about it as honestly as I could, to the best of my memory.
Who is right, in terms of memory? Brain science tells us that memory changes as soon as we remember something. Just the act of remembering will shift the details.
And are my stories always my own? Do I write them without considering the others who were involved? Sometimes, I do. Sometimes, not.
There are many approaches to dealing with how much of your story you own, and I recently came across one of the best articles on it. No easy answer here, but thoughtful ideas. It's your writing exercise for the week. Check it out here.