Answer
Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh.
In The Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
The use of oxygen to help your mother breathe does not break her fasting.
In his response to the question, Dr. Muhammad M. M. Abu Laylah, the late Professor of the Islamic Studies & Comparative Religions at Al-Azhar University, states:
Such use of oxygen to help your mother breathe does not break her fasting. In case harm is inflicted on her by fasting, she is permitted to break her fasting and she can offer fidyah by feeding a poor person for every single day of fast she has missed, and she does not need to make up for the fast she has missed if her sickness remains with her forever.
Allah Almighty knows best.
Editor’s note: This fatwa is from Ask the Scholar’s archive and was originally published at an earlier date.