I think of this in 2 ways.
DS probably has a higher IQ than me, 'probably' because niether of us have been tested so i have no real numbers. But the speed in which he learns is pretty rapid.

However currently i'm 'smarter' because i know more 'things' than him IYKWIM.

But i fully expect that one day he will be both smarter and have a higher IQ.

DD i don't know, but so far she has worked out pretty well how to push my buttons and get me to angry quicker than anyone i've ever met and i don't get angry easily...