In Islam, girls are the counterparts of boys, and hence parents should not make any kind of discrimination as such behavior from the parents’ side breeds hatred and enmity among their sons and daughters, and that is why it has to be avoided. In more than a Prophetic hadith, the Prophet ordered Muslim parents to treat their kids equally, without partiality or favoritism. For example, the Prophet (peace and blessings be upon him) is reported to have said, “Fear Allah and deal justly and fairly among your children!”
Sheikh Ahmad Kutty, a senior lecturer and Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states: “As parents they are mandated to treat all their children with fairness and justice. Since they have not done so, you are not to be blamed for your feelings of bitterness towards them.
It is imperative that parents deal justly and fairly among all their children. The Prophet (peace and blessings be upon him) said, “Fear Allah and deal justly and fairly among your children!”
according to an authentic hadith jointly reported by Al-Bukhari and Muslim, we read that once a man appeared before the Prophet (peace and blessings be upon him) and said, “I intend to give this son of mine a gift.”
The Prophet asked, “Do you have other children?” He said, “Yes.” He asked, “Did you give them all a similar gift?”
the man replied, “No.” Then the Prophet said, “Don’t make me witness for this, for I cannot be a witness for an unjust act!”
the Prophet further asked him, “Do you expect all of your children to act fairly and kindly towards you?” He said, “Certainly.” Then the Prophet said, “Then you, too, must never act unfairly towards any one of them!”
Since it is not healthy to carry such feelings and brood over them, children must bring this matter to the attention of their parents so that they themselves take the necessary steps to rectify the situation. Let them know how their behavior has paved the way to creating ill-feelings and bitterness in your minds against them as well as your siblings. If the other brothers and sisters are fair enough and Islamic-minded in their thinking, they should not accept anything from parents if it amounts to depriving their siblings of their legitimate rights.