Is that 2x6 cross piece at the edge of the roof over the doorway structural? Or was it placed there for support during transport? If just for transport, is appears you could remove it and then just flash and finish the roof.

I think you need to avoid, at all costs, having that family member doing any more construction for you, especially if he's not going to finish the job.

The desert is a true treasure for him who seeks refuge from men and the evil of men.
In it is contentment
In it is death and all you seek
(Quoted from "The Bleeding of the Stone" Ibrahim Al-Koni)

member of the cabal of dysfunctional squirrels?