I was watching a Ted lecture titled "Jarrett J. Krosoczka: Why lunch ladies are heroes" and came across this paragraph.
And she looked at me, and I could tell that she recognized me, but she couldn't quite place me, and she looked at me and she said, "Stephen Krosoczka?" And I was amazed that she knew I was a Krosoczka, but Stephen is my uncle who is 20 years older than I am, and she had been his lunch lady when he was a kid. And she started telling me about her grandkids, and that blew my mind. My lunch lady had grandkids, and therefore kids, and therefore left school at the end of the day?
I don't understand what he meant by "and therefore kids" both grammar-wise and meaning-wise because as far as I know, "therefore" should have a full sentence.
Can anybody explain this to me?