Ruling on giving wealth to one of the children due to his illness

Question:
I have sons, daughters, and two wives, and I have a daughter who has some illness. Do I have the right to give her some money, and is that permissible? I ask for your guidance. May Allah reward you with good.

Answer:
Treat the sick daughter and spend on her as long as she is poor and in need, but do not single her out with anything to the exclusion of her sisters, if she has sisters, or her brothers; do not single her out with anything, not a house, nor wealth kept specifically for her. Allah provides for the sustenance of everyone.
However, the poor person is given to the poor person, and one spends on him, and the sick person is treated, and there is no favoritism in this. Favoritism is giving someone something beyond that, or preferring one over another, or singling out some of them to the exclusion of others. The Prophet (peace and blessings be upon him) said: As for treating the sick person and spending on the poor person, that is not favoritism, for the rich person has become self-sufficient with what Allah has given him of wealth.