A more natural way to write it: A friend of mine has a mother who just died/passed away. com. (I'm not the best person to give advice about it, so I'm just suggesting the site.
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A more natural way to write it: A friend of mine has a mother who just died/passed away.
People ask and discuss this kind of question at Quora.com.
(I'm not the best person to give advice about it, so I'm just suggesting the site. I saw phrases listed there and very good advice.)