That's not really dissing a family that does right by their kids like this... it's just... if the media came knocking and asked US what our secret sauce recipe was? (And.. um-- sometimes they have, actually)
We politely demur and thank them for their positive interest, but it's idiosyncratic and private-- and about OUR KID, not our "method."
Is it so idiosyncratic or mysterious? The average IQ of the children of two PhDs is probably in the 120s, and they are much more likely to have children with IQs >= 145 than parents with average IQ of 100.
