I'm surprised you want to share something that intensely personal. If you decide to include it, I recommend referring to it in a much more subtle way: a "family tragedy" or "severe health crisis", for example.
If you do go forward with this, you also need approach your mother and ask for her blessing (I assume she's living; my sincerest apologies and sympathy if that assumption is incorrect). However personal the tragedy was for you, it was much more so for her. Don't alienate your mother for the sake of a memorable personal statement.
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