User blog comment:KidVegeta/Canonicity/@comment-3097771-20101204091130

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Bio-Broly is not canon. This is for various reasons, as the actual movie isn't too bad canon-wise. However, the previous movie, Second Coming is not canon, so none of the events of this movie could have taken place. Also, the timeline point for this movie is not so clear, and could have only taken place after the end of the Buu saga. However, if that were the case, Goten and Trunks would have fused into Gotenks, which did not happen. And as was already mentioned, this movie could not have taken place before the Buu saga, due to the nature (and briefness) of the timeline during that period.

Final Ruling: Not canon -KidVegeta