The ruling on fasting on behalf of a mother who is unable to make up Ramadan

Question:
This questioner says: My mother has to make up the fasts of last year's Ramadan, but she is unable to fast because she gets very tired. Is it permissible for me to fast the make-up fasts on her behalf?

Answer:
Fasting is a physical act, and prayer is a physical act; one does not act on behalf of another in these. As long as a person is alive, no one fasts on his behalf. A person who is still living is not fasted for by anyone. However, if he dies and he has fasting to make up, his guardian fasts on his behalf, as stated in the hadith. But as long as he is alive, no one fasts on his behalf.
If he is able to fast, he fasts. If he is not able, he postpones the fasting until he is able and makes it up. If he is not expected to make it up because the excuse continues with him, then as mentioned previously, since his excuse is ongoing, he feeds one poor person for every day. Yes.

The presenter:
May Allah reward you,