Who did God promise to be the father of all nations?

In Genesis 17:19-21 God promises Moses that he will bless Ishmail and
make him the father of twelve rulers and into a great nation.

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Answer #2:

Whoops!

-- Moses never appears in Genesis. That conversation was with Abraham.

-- If you back up a little way in the same chapter, practically on the same page,
back to Verses 4, 5, and 6, what Abraham actually heard first was:
" ... this is my covenant with you: You shall be a father of a multitude
of nations. Your name shall be called Abraham, for I have made you
the father of a multitude of nations. I will make you most exceedingly
fruitful, and make nations of you. And kings shall descend from you."
... ... ...
"As for Sarah your wife, I will bless her. I will give you a son through her ...
and she will give rise to nations. Kings of peoples will rise from her."
That's when Abraham says "That'll never work. Sarah is old and I'm even older.
Don't get carried away. We already have Ishmael. Have you considered him, lord."

And the Manager replies: Are you listening to me, Abraham?
"Your wife Sarah will bear you a son and I will fulfill my covenant
with him."

But since you've put in a good Word for Ishmael, I'm willing to
go along with you.
And THAT's where we come to
"I will make him fruitful, and will increase him most exceedingly. He will
beget twelve princes and I will make him into a great nation.

BUT I will maintain my covenant through Isaac whom Sarah will bear to you ..."
If you're going to quote something, at least take a moment to look around it. Make
sure that you're not about to lift something out of context and flip it 180. OK ?