Dead Son will become New Father

I'm rather disturbed by the whole thing.
The mother should've learned to let it go, even if that was her sons wish to become a father it would've been with a woman he knew, loved and wanted to have a child with. Not some stranger that his mother picked out.
Secondly why would any women really want to mother a dead mans child? I know that many women want children and pay for them to have them and never actually know who the father is. But a dead mans child is a bit weird.
Thirdly it's not really fair to the child is it.
"Mommy wheres daddy?"
"Well you see, he died four years before you were born, I was picked out of 200 women to have you."
Not a nice thought.

Also, what happens is the mother wants a grandson and she gives her a granddaughter? Is she going to be mad with the woman about it?
Could the mom turn round and say thats my sons child I want custody? And what happens if the pregnancy fails or something? will she try it again or will she interview another 200 women for the job?

Jam it back in, in the dark.