Nine years ago, after I graduated from college and was officially living on my own, my mother told me I should come home for Thanksgiving because "Dad's not doing so great, and if you want to see him, this may be your last chance." When I got home and realized my dad wasn't actually dying, I asked her why she had said he was. She explained, "I wanted to see you!" I don't know why she didn't try saying that first.
A couple holidays later she lied about my grandmother dying, but I knew what was going on by then.