In the same circumstances I wouldn't dream of expecting the son to provide me with a bed for the night especially if I would be in the house on my own. Nor would I expect to be able to go back into a house that didn't belong to me and where I had never lived without supervision, not because I would have dishonest intentions but because it is someone else' property and I would have no right to be there. I would have returned the key at the first available opportunity, ideally the night of the death but it would have been forgivable to overlook such a matter at the time.
Only 50% of middle age adult manage more than 1 brisk 10 min walk a month.
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