Family Dinners?

Question

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Who is most disruptive at the big family dinner: two brothers who see things differently regarding religious beliefs, or a third brother who tries to pit the other two against each other by renewing old arguments?
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If a neighbor, rather than a brother, drops in and tries to do the same thing, what can the brothers do?
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Answer 1

If there is an impasse of opinions, then ban the topic from the dinner table.

When a guest shows up, and the question is asked, politely inform him that the subject is not allowed for discussion and nip it in the bud quickly.

Answer 2

Change the topic. Talk about the weather.