The ruling on taking a son's share from the wealth of his mother who is afflicted with dementia to establish a continuous charity

Question:
May Allah reward you. This man says: My mother is an old woman who has become senile. She has wealth, and we provide for her and care for her. We want to give charity on her behalf, such as digging a well or a cistern. My brothers have, in a sense, given permission for this. Is our disposition of this wealth valid?

Answer:
No, it is not valid. Go back to the court, go back to the judge. He will appoint a guardian over her, and the guardian will preserve her wealth. Nothing is to be taken from it except the obligatory zakah. The zakah that is obligatory. He preserves it until the matter becomes clear through her death or her recovery. Her wealth belongs to her; no one may dispose of it for himself or give charity from it, except for the payment of zakah, which her guardian and her wali (guardian) will pay. Yes.