Story Sarah, Hager, Prophet Abraham & their sons

Re: Story Sarah, Hager, Prophet Abraham & their sons

Quoting from Bible has its perils. Lets stick to what Quran says and that is Abraham sacrificed Ishmael, right? If Bible says that Abraham did not go to Mecca ever we dont have to believe it as we know that the Kaa'ba itself was built by Abraham.
The other part of discussion is who was the mother, Sara or Hagar. I dont have any clue to it so please enlighten me on the subject, any one!