How much DNA does someone share with their great-great-great-great grandfather?

Answer 1

I'm not sure exactly how to do this, but my guess is that if you set the 4 times great grandfather at 100% and divide by half you'll get this...

4 times great grandfather 100%
3 times great grandfather 50%
2 times great grandfather 25%
great grandfather 12.5%
granfather 6.25%
father 3.125%
you 1.5625%

*these percentages are the DNA shared between the person and the 4 times great grandfather*

So you have 1.5625% shared DNA of your 4 times great grandfather