“I have two sons, Bill and Ben”: comma or colon?

I agree the colon precedes a list, but a list composed of at least three items. In your example, the colon would seem to be too strong. However, I don't have a citation or formal support for my position.

In legal documents, to be extra clear, I often use a colon, and plus, I would add numbering, like this: "I have two (2) sons: (i) Bill; and (ii) Ben."

In this case, using a comma is appropriate. A colon typically introduces a list or emphasizes a point, but in your sentence, the phrase "Bill and Ben" is simply providing additional information about your sons. Therefore, a comma is more suitable for this context.
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Punctuation can sometimes be a matter of personal preference. In your sentence, "I have two sons, Bill and Ben," the comma is commonly used before listing things. Some people prefer to use a colon instead, like this: "I have two sons: Bill and Ben."

However, using a colon might seem a bit formal for just two items. It's more commonly used for longer lists.

If you're unsure, you could rewrite the sentence to avoid the list format altogether, like this: "I have two sons named Bill and Ben."

In the end, both the comma and the colon are correct, so you can use whichever feels right to you.