I'm going to say that at first, it's 50% that it's a girl. But you've already said one is a girl. Now, intuitively I want to say that it's obviously not 100% that the other kid is a boy, obviously. But I don't think you halve the remaining 50% for the next child either, so I went with 33%.
I wish I could justify my answer better. But all I have is that it seems like it's in between 50 and 25 for me.
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