I heard that some rishonim of blessed memory said demons can have intercourse with humans. So could demons have kids with humans?
That is certainly the implication of, say, Rashbam (to Bava Basra 73a) who writes that Hormin was born from a man who fornicated with a female demon. And the same is implied by the notion that Sichon and Og were born of the "fallen angels" who copulated with human women (as angels and demons seem to be similar sorts of creatures).
For more sources on this topic, see what I wrote at: