Looks more like BBC bought DFH than a merger
There isn't enough information in that article about how the deal is going to be structured to make that determination.
If you search "dogfish head" on the Delaware SOS website, there are a number of different entities, including Dogfish Head Craft Brewery LLC, Dogfish Head Holding Company, and Dogfish Head Companies LLC. I don't see that they are saying anywhere which are being acquired and how.
From a consumer standpoint, I don't know if it really matters much. Somehow, BBC will own some or all of DFH.
I think the more interesting question is what type of control Sam will have in BBC. The article notes the Calagiones are getting 407K shares of BBC, but it doesn't say what class or if there are any particular voting rights attached to them (though it does mention they are based on a share price of $314, which sounds like Class A?). BBC common stock is Class A, and it comes with only limited voting rights. Jim owns 100% of the Class B stock which allows him to elect a majority of the board of directors and unilaterally approve other important decisions. Sam is getting a seat on the board, and I wonder what mechanism exists to ensure that he keeps it (directors being elected by shareholders).
There's more to the story than Company A buying the shares of Company B (or forming a wholly owned subsidiary that then mergers into Company B).
Edit: Well, stupid me wrote all of the above without doing a more thorough search of the BBC's most recent SEC filings. They filed an 8-K two days ago with all the gory details. The Calagiones are getting Class A stock, and the merger will be between a subsidiary of the BBC named Canoe Acquisition Corp. and Dogfish Head Holding Company (with Canoe being the surviving entity).
There's a lot of other interesting stuff going on (agreements to purchase shares of other DFH entities, employment agreements for both Sam and Mariah, etc.).
You can read the full 8-K here:
https://www.bostonbeer.com/static-files/b74ce9f7-e26b-41c4-b71b-76308ef67ac1