We use this joint at the top of a king-post within a truss.
I cannot find a fishtail tenon in the list so I assume you guys call it something else.
What do you call a fishtail tenon?
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No we just call it tenon to two beams.
Create a tenon to the first beam and then a tenon to the second beam. Now make a horizontal cut if you do not like the upper part of the two tenons.