ANSWER:

Their fast is not valid as they must observe the fast with the majority of Muslims where they live. 

QUESTION: Some people observe their fast according to Saudi Arabia’s schedule, even while living in Pakistan, where there is a one-day difference. Is their fast valid? I have heard that we should follow the fasting schedule of the place where we reside.”

Fasting, Fasting and Ramadan | March 26, 2025 2:11 am
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QUESTION: I have neighbors with children who aren’t doing well financially. They have an apartment and money for food, but the one salary barely covers her expenses. Sometimes they can cover everything, and sometimes they have to go into the red (e.g. little food). Can I give them Zakat al Fitr, or does it have to be given to someone who is much worse off?
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QUESTION: My brother is an independent/financially independent adult but does not fast or pray. Is it acceptable for my mother to pay zakat al fitr on his behalf without him knowing?