A Single Base Pair

My father was the firstling.
No more mutant than the next
Man, but in the wrong places.
I am nothing but

A loose collection
Of human limits. I am
The lastling after just one

Generation. Him, me, then
No one quite like us again,
Not one of his grandchildren.
And that's how it goes.

Only sin can set you free.
Kindnesses will eat you whole.
Ask me how I know