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Does anyone here have a howto for uncluttering the accumulated stuff of other people?

I live in this house in which my father has been living in for 50+ years, and my mother for 30, and they are still alive but have both in a way abdicated their responsibility for most of the stuff in here... and it is doing my head in. But I do not know where/how to even start, and all the decisions to make make me collapse from decision fatigue before I even get there...