Is it permissible for a mother to tear up a partnership contract between her and her son and waive her right to a pharmacy to ensure his equality with his other siblings whom she has financially assisted, while neglecting her only daughter from this assistance?

The mother must be fair among her children in giving gifts. Favoritism is permissible for a valid reason, such as need or knowledge. The mother's right is great, even if she acts poorly. The questioner should think well of her mother and advise her gently and kindly. If the favoritism is without a valid Shar'i (Islamic legal) justification, then the favored one should share with their siblings. Scholars have differed on how to be fair between male and female children; some said that the male receives the share of two females, while others said that there should be equality.