[Honestly, there's a reason he wasn't pulling this reasoning out when the question was first posed. He didn't want to come off as manipulative, using their daughter to get one answer or another out of Hal. Because Barry knows Hal - he knows he'd do anything for their little girl.
So he knows that Hal will eventually agree to a wedding, but he hopes he won't be upset about it. When he specifies less than a hundred people, Barry laughs, leaning in to hug him.]
Less than fifty, if we can manage it. Family and close friends only. I am not inviting half the League. [They probably won't get away with less than 50 people, but definitely can manage less than 100.]
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So he knows that Hal will eventually agree to a wedding, but he hopes he won't be upset about it. When he specifies less than a hundred people, Barry laughs, leaning in to hug him.]
Less than fifty, if we can manage it. Family and close friends only. I am not inviting half the League. [They probably won't get away with less than 50 people, but definitely can manage less than 100.]