If he is not sane anymore, prayer is not mandatory upon him.

this is a question from my mum.My dad is 92 years old,most of the time he is in bed,we try to remind him of the prayer times and make tiammum for him and ask him to pray.Sometimes he prays some times he forgets and behaves like a kid.ls there any ransom?Do we have to calculate how many prayers he is missing?

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