All praise is due to Allāh:

The giving of gifts, donations, and voluntary charity does not require observing the rules of inheritance. This is because inheritance deals with rights and obligations, while gifts and donations involve waiving one’s rights and ownership. Waiving one’s rights is a right of the person waiving them, and the principle behind it is generosity and kindness. The estimation of the value of the gift can be based on the donor’s discretion. For example, a daughter’s gift may be higher than her brother’s due to her younger age, illness, or specific need, and there is no harm in that.

After all, Allāh knows best.

Fatwa issued by Dr. Khālid Naṣr