A young man whose mother left behind making up days of Ramadan before twenty-one years ago

Question:
May Allah reward you. In his other question, he says: I am a young man who is twenty-one years old. I once asked my mother in which month I was born, and she said it was Ramadan. She said that she broke her fast for twenty days and has not made them up to this day. What is obligatory for her to do? And is it permissible for me to make them up on her behalf? Please advise us. May Allah reward you with good.

Answer:
If she is still alive, it is obligatory for her to make up the fasts and feed one poor person for each day as expiation for the delay. As for if she has passed away, then if you fast on her behalf, that clears her obligation. This is part of being dutiful to her and doing good to her. Yes.