Pharaoh was nevertheless impressed with Abram's righteousness and sent his own daughter Hagar to be a handmaid

definitely not from the Bible

I have difficulty believing a Pharaoh would give His own daughter as a slave to someone

I see about three places or so where the Bible descibes Hagar as Sara's handmaiden and after living in Canaan 10 years Sarah 'gave' her to Abram as a surrogate wife to have a son

This isn't the kind of description one would expect for a Egyptian princess given to Abraham years before and in any case not something the Bible brings up

Here is one source -----

http://www.emanuelnyc.org/bulletin/archive/51.html

However, this story keeps changing so much your head starts to spin because there is so much evidence to point toward Ishmael being the son of sacrifice and the son of promise.

History is enough to show whom God favored the most.

If you study the original hebrew texts you will see the description of Ishmael was that of an infant carried on his mothers shoulders. He was put under a bush and lifted into the hand of his mother. Not the description for a 17 year old boy !!

In fact God had sent Hagar and her infant out to Paran/Arabia 14 years before the birth of Isaac. God sent them out so they would not befall the disasters that were coming into Jerusalem and the surrounding area.

From the Lineage of Ishmael God was to send the "Prophet Like Unto Moses" as the Final Prophet with the final law and book.

It is my understanding that Hagar is not considered a wife of Abraham, but his concubine (modern terminology, mistress). That's not what Genesis 16:3 says.

Sarah was an intelligent woman. Why on earth would she permit Abraham to commit adultery with Hagar just to preserve his seed? In addition, why would Abraham willingly go along with that? Was he that desparate for a child? She respected and honored him; therefore, she permitted him to do the honorable thing in marrying Hagar. Ishmael is not Abraham's illegitimate son as many people believe and accept. He and Isaac are both legit.