Spoiler,
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First up, I shall assume you want to take the path of good.

If not, ignore the rest of this post.

Otherwise scroll down.
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Okey dokey, first thing first, you can choose any of the family. Really! It doesn't matter! Want to know why? Scroll down further my friend.

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So you went to one of the households and agreed to help him/her to retrieve the 'heirloom'. When you go to the graveyard, someone will intercept you and offer you an alternative. If you play goody-two-shoes, choose to follow this alternative.

Besides, both families will backstab you when you turn over the 'heirloom' to them.
Interested in knowing who the third party is?

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It's the Mayor.
Thank you for reading.
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If not a Sorcerer, then a Paladin.