Is the feeling of injustice wrong and does it spoil the reward for good deeds when, after helping her family financially, their treatment of the daughter changes and they begin to focus only on her money, while the rest of the siblings do not help the family at all? And is it permissible for parents to blame and pressure one daughter without the rest of their children?

Filial piety is among the most emphasized rights and greatest acts of devotion, as Allah the Almighty says: "And We have enjoined upon man [to be] good to his parents" and "And your Lord has decreed that you worship not except Him, and to parents, good treatment." Strive to be dutiful to them by serving them, accompanying them well, and spending money on them for the sake of Allah's pleasure and theirs, for "The pleasure of the Lord is in the pleasure of the parent, and the displeasure of the Lord is in the displeasure of the parent." If the parents are in need, their maintenance is obligatory upon you and your able siblings, and it is advisable to agree upon a monthly sum to support them. Do not pay attention to their lack of appreciation for your efforts, for your goal is Allah's pleasure, and always treat them with kindness and reverence, and do not let your feeling of injustice affect your words or actions. You are not obligated to financially support your relatives other than your parents and children.