What are you proposing? That the email notification for the post…
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only shows its “parent”, the post it is a direct reply to (assuming it was a direct reply and not an @name mention or blockquote reply, one among many.. you can have five “parents” for a post if there are five quotes in it.)
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shows the previous (n) posts “above” this one, earlier in the topic stream.
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shows the next (n) posts “below” this one, later in the topic stream
I can see a case for #2, I guess, if you are getting a direct reply to a post nowhere near the bottom of the topic stream.