Your question about Sara will be answered. Please read the book of Jasher. Chapter 12 verse 44.
It says that:
And at that time Nahor and Abram took unto themselves wives,the daughters of their brother Haran. the wife of Nahor was Milca, and the name of Abrams wife is Sarai. And Sarai, wife of Abram was barren. she had no offspring those days.
It is clearly stated that Sarai was the daughter of Haran.
Your question about Sara will be answered. Please read the book of Jasher. Chapter 12 verse 44.
It says that:
And at that time Nahor and Abram took unto themselves wives,the daughters of their brother Haran. the wife of Nahor was Milca, and the name of Abrams wife is Sarai. And Sarai, wife of Abram was barren. she had no offspring those days.
It is clearly stated that Sarai was the daughter of Haran.