"Grand Parent" to refer to a post two levels up, though sometimes it's used contextually to mean whatever-post-that-started-off-this-thread (vs. "OP" or "Origin

"Grand Parent" to refer to a post two levels up, though sometimes it's used contextually to mean whatever-post-that-started-off-this-thread (vs. "OP" or "Original Post(er)" for the top-level post).