Question: My mother suffers Alzheimer disease which makes her forgetful and can recognize neither the relatives nor times, such as the month of Ramadan. Last Ramadaan, for example, she did not fast. Moreover, she is feeble in the sense that she cannot eat food enough to enable her to fast. Is it obligatory on her to fast? What should she do regarding the past Ramadaan that she did not fast? What should she do regarding Salaah (Prayer), as she cannot recognize their due times and the number of Rak`ahs (units of Prayer), but she performs Salaah according to her estimation? Please give us a Fatwaa, may Allaah reward you!
Answer: If the condition of this woman is as mentioned in the question, it is obligatory on her neither to perform Salah nor fast, since, as mentioned in this case, she is not accountable for her actions. The Prophet (peace be upon him) said: There are three whose actions are not recorded: an insane person until he is restored to sanity, a sleeper until he awakens, and a boy until he reaches puberty. The person whose mind became disordered has the same ruling as an insane person… read more here.