I think you’re actually confused about the term, see my responses elsewhere in this thread.

If you are going to refuse to actually look at what the term means and insist that you are correct there is no conversation to be had.

Look, I don’t know what to tell you. Dictionaries contain the meanings of words and terms as commonly used. If you look up “nuclear family,” the meaning comports entirely with how I have been using the term. I’m sorry that’s inconvenient for your self conception.