My parents just call me "Son" now.
Maybe they do it just so they remember my relationship to them, but I really think that they've forgotten my name.
Not once have I heard them call my sister "daughter". Not once.
Being called "son" is only one step up from them calling me "Chief" or "Pal".
Maybe its payback for calling them "Mom" and "Dad", but that's how I was taught.
By them, no less!