Pegg
Jehovah our God is One
So there was abuse against Ishmael (pbuh) and Hajar from Sarah and Abraham (pbuh) ?
The character of Hagar and Ishmael showed they themselves were abusive to to Sarah and Isaac. Hagar looked down on Sarah because she could not have children and Ishmael was a bully toward Isaac when he was born.
Anyway, they were sent away at Gods order.
Genesis 21:12 Then God said to Abraham: “Do not be displeased by what Sarah is saying to you about the boy and about your slave girl. Listen to her,* for what will be called your offspring* will be through Isaac.+13 As for the son of the slave girl,+ I will also make a nation out of him,+ because he is your offspring.”*
14 So Abraham got up early in the morning and took bread and a skin bottle of water and gave it to Ha′gar. He set these on her shoulder and then sent her away along with the boy.+ So she departed and wandered about in the wilderness of Be′er-she′ba.+