I read a few months ago (on Reddit) that Alexa had acquired some question context. But none of the examples worked for me. Now they do work (more often at least).
Q "Alexa who is Mitt Romney?"
A Description of him and his being Republican Party's nominee. (I don't really care but Obama was a bit too obvious.)
Q "Alexa who is his wife?"
A Correct answer
Q "Alexa, who are his children?"
A Correct answer (So the context is still Mitt Romney; "Who are her children?" doesn't work.)
Q "Alexa calculate 19 minus 7."
A 12
Q "Alexa calculate that multiplied by 3."
A (Yesterday) 36
A (Today) "Hmm, I'm not sure what you meant by that question."