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MB3 175b: Who Can Save Food on Shabbos from a Fire? (334:1-3)
Other people whose house isn't the one on fire may save all the items on behalf of the owner since they won't come to forget themselves and put out the fire. (Muktzah is suspended in cases of major financial loss).
Even if one already saved food for the entire household, other members of the family can save food for themselves.