Zakah on money deposited with a mother for her daughters

Question:
Honorable Shaykh, my mother has money that she set aside for my sisters, the married ones, to take whatever they need from it. However, she has not paid zakah on it for years. What is the ruling in this case? And if there is zakah due, how is it calculated, and what is the nisab (minimum threshold for zakah) regarding Saudi sweets?

Answer:
Zakah is obligatory on the owners of the money. Each one is required to pay zakah on her own money. If they appoint their mother, who is the one holding the deposit, to pay the zakah on behalf of all of them, there is no harm in that. However, if they do not appoint her, she has no right to pay it; rather, zakah is obligatory on the owners of the money. Each one pays zakah on her share if it reaches the nisab. If it reaches the nisab, she pays zakah on it. Yes. As for the one with whom the money is deposited, nothing is required of him unless he is appointed. If he is appointed by the depositors, there is no harm. Yes.