> My dyslexic younger brother with his 120 IQ could not hope to be as
> analytical, logical, and quick thinking as I, while I, with my 160 IQ, will only
> rarely think on the level of an even greater genius, if at all.
Richard Fynnmen's verbal skills were weak, and he only scored 125 on a IQ test, yet he was probably the great physist of our time. Have your bother take the IQ test http://www.iqtest.com, where they measure and report on 15 separate skills.
I found out that 14 of my 15 abilities were 20-30 points higher than you would expect from my single number IQ score. Considering that your brother is dyslexic, and still manages to score 120, I wouldn't be surprised if your brother share some, but not all, of your talents.