Well , as for Medea killig her brother so her father would not be able to follow her since she scattered his body was cruel. She went with her husband Jason and then fell in love with Aegeus. Aegeus already had a girlfriend and Medea was jealous so she cursed Aegeus so he could not have a child. Aethra Aegeus girlfriend then came to Medea and asked for a child , so Medea gave her one by Theseus. When Jason did change his mind and fall in love with another Medea was mad and sent a cursed robe to his lover killing her. And this is where the story changes some say Medea killed her children , some that a king did since she had killed Jasons lover. Also the legend of her Mother and Father are also interesting. Well , I am not sure what I think of her. She was evil yet, in some cases she had a reason to. But by no means in all cases did she choose the right way to solve her problems.
Medea asked Aegeus to give her shelter after she killed the princess and king, and in return she would cure his sterility. She wasnt in love with Aegeus though. Medea killed her children because her hatred of Jason overpowered her love of her children.