My entire family dislikes my sister's fiance, and she knows it. What can we do?

He is rude to her. He has many bad habits (some of which are illegal). They have been together for 5 years, and she has been paying for him for the last 3. Also, he threatens to leave her about once every month. The last time he threatened was 3 weeks ago. Then, out of the blue, he proposed to her two days... show more He is rude to her. He has many bad habits (some of which are illegal). They have been together for 5 years, and she has been paying for him for the last 3. Also, he threatens to leave her about once every month. The last time he threatened was 3 weeks ago. Then, out of the blue, he proposed to her two days ago. We have all been hoping and praying this would not happen.

Now what?
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