Is my boss flirting with me? Why would he say that?

Caroline1993
My boss is almost 20 years older than me, he is also married! He helped me close a deal so when he called me to congratulate me first thing he said was “who’s your daddy?” It was kinda weird…. He surely wouldn’t have said that to a male employee. Why would he say that? Should I tell someone?
Is my boss flirting with me? Why would he say that?
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