Bakit Pinalayas ni Sarah si Hagar?

During a very rare, accidental biblical discussion, my mother asked me that question. She supplied an answer that I didn't remember reading so I looked it up. Genesis 21:8-13. In different translations.



 KJV

8 And the child grew , and was weaned : and Abraham made a great feast the same day that Isaac was weaned . 9 And Sarah saw the son of Hagar the Egyptian, which she had born unto Abraham, mocking. 10 Wherefore she said unto Abraham,Cast out this bondwoman and her son: for the son of this bondwoman shall not be heir with my son, even with Isaac. 11 And the thing was very grievous in Abraham's sight because of his son.12 And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall thy seed be called. 13 And also of the son of the bondwoman will I make a nation,because he is thy seed. 

ESV

God Protects Hagar and Ishmael 
8 And the child grew and was weaned. And Abraham made a great feast on the day that Isaac was weaned. 9 But Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, laughing. 10 So she said to Abraham, "Cast out this slave woman with her son, for the son of this slave woman shall not be heir with my son Isaac." 11 And the thing was very displeasing to Abraham on account of his son. 12 But God said to Abraham, "Be not displeased because of the boy and because of your slave woman. Whatever Sarah says to you, do as she tells you, forthrough Isaac shall your offspring be named. 13 And I will make a nation of the son of the slave woman also, because he is your offspring." 

NIV

Hagar and Ishmael Sent Away 
8 The child grew and was weaned, and on the day Isaac was weaned Abraham held a great feast.9 But Sarah saw that the son whom Hagar the Egyptian had borne to Abraham was mocking, 10 and she said to Abraham, "Get rid of that slave woman and her son, for that slave woman's son will never share in the inheritance with my son Isaac." 11 The matter distressed Abraham greatly because it concerned his son. 12 But God said to him, "Do not be so distressed about the boy and your maidservant. Listen to whatever Sarah tells you, because it is through Isaac that your offspring will be reckoned. 13 I will make the son of the maidservant into a nation also, because he is your offspring." 

 NAS

8 The child grew and was weaned, and Abraham made a great feast on the day that Isaac was weaned.

Sarah Turns against Hagar

9 Now Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, mocking. 10 Therefore she said to Abraham, "Drive out this maid and her son, for the son of this maid shall not be an heir with my son Isaac." 11 The matter distressed Abraham greatly because of his son. 12 But God said to Abraham, "Do not be distressed because of the lad and your maid ; whatever Sarah tells you, listen to her, for through Isaac your descendants shall be named. 13 "And of the son of the maid I will make a nation also, because he is your descendant." 

WEB

21:8 The child grew, and was weaned. Abraham made a great feast on the day that Isaac was weaned. 21:9 Sarah saw the son of Hagar the Egyptian, whom she had borne to Abraham, mocking. 21:10 Therefore she said to Abraham, "Cast out this handmaid and her son! For the son of this handmaid will not be heir with my son, Isaac." 21:11 The thing was very grievous in Abraham's sight on account of his son. 21:12 God said to Abraham, "Don't let it be grievous in your sight because of the boy, and because of your handmaid. In all that Sarah says to you, listen to her voice. For from Isaac will your seed be called. 21:13 I will also make a nation of the son of the handmaid, because he is your seed.

 Douray-Rheims

21:8. And the child grew, and was weaned: and Abraham made a great feast on the day of his weaning. 21:9. And when Sara had seen the son of Agar, the Egyptian, playing with Isaac, her son, she said to Abraham: 21:10. Cast out this bondwoman and her son; for the son of the bondwoman shall not be heir with my son Isaac. 21:11. Abraham took this grievously for his son. 21:12. And God said to him: Let it not seem grievous to thee for the boy, and for thy bondwoman: in all that Sara hath said to thee, hearken to her voice: for in Isaac shall thy seed be called. 21:13. But I will make the son also of the bondwoman a great nation, because he is thy seed.

 Christian Community Bible

Abraham dismisses Hagar

8 The child grew and on the day Isaac was weaned, Abraham held a great feast. 9 Sarah saw the child that Hagar, the Egyptian had borne to Abraham, mocking her son 10 and she said to Abraham, "Send this slave girl and her son away; the child of this slave must not share the inheritance with my son, Isaac."

11 This matter distressed Abraham because it concerned his son, 12 but God said to him, "Don't be worried about the boy and your maidservant. Listen to Sarah and so whatever she says, because the race which is called by your name will spring from Isaac. 13 But from the son of your servant I will also form a nation, for he too is your offspring."

The New American Bible

8 Isaac grew, and on the day of the child's weaning Abraham held a great feast.
9 Sarah noticed the son whom Hagar the Egyptian had borne to Abraham playing with her son Isaac; 10 so she demanded of Abraham: "Drive out that slave and her son! No son of that slave is going to share the inheritance with my son Isaac!" 11 Abraham greatly distressed, especially on account of his son Ishmael. 12 But God said to Abraham: "Do not be distressed about the boy or your slave woman. Heed the demands of Sarah, no matter what she is asking of you; for it is through Isaac that descendants shall bear your name. 12 As for the son of the slave woman, I will make a great nation of him also, since he too is your offspring."

  By the end of my quest, I was dizzy.