All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
In Islamic legislation, the position and status of the mother is very great as she has a great right on her children. She carried her children in her womb and breastfed them and nurtured them while they were very young. Allaah Says (which means): {And We have enjoined on man (to be dutiful and good) to his parents. His mother bore him in weakness and hardship upon weakness and hardship, and his weaning is in two years, give thanks to Me and to your parents.}[Quran 31:14] Indeed the Prophet was asked: "Who deserves my good company more?", and he replied: "Your mother, then your mother, then your mother, then your father." [Al-Bukhari and Muslim] So you have to be kind to your mother. The fact that she was negligent towards you should not be a reason for cutting relations with her. Indeed you did well by not hating her or harming her. However, it is not permissible for you to neglect her or do anything that might make her feel that you are not interested in her, otherwise you are wrong. Besides, you have to endeavour to treat her well.
Among the things that would help you to love her is to remember the status and the position that the Islamic legislation has allocated to her, and remember that pleasing her is a means of living in eternal happiness in
Finally, it should be noted that if the mother remarries she loses the right to foster her children, so this right is transferred to whoever is more appropriate of her female relatives, like the grandmother and the like. A woman came to the Prophet complaining: "O Prophet of Allaah! I carried my son in my womb, I nestled him, hugged him and protected him within my arms, and I breastfed him, and his father who divorced me wants to take him away from me. Does he have the right to do so? The Prophet replied: "You have more right in fostering your child than your husband as long as you do not remarry." [Abu Daawood] It appears that it is for this reason that when your mother remarried she left your fostering to your grandmother and aunt.
Allaah Knows best.