This is interesting. I took a survey of my friends. I don't know too many people who even have three kids, and most that do get a pp first, so I didn't count them. Out of 30 families whose first two children were the same gender, 16 had the same gender again (12 BBB and 4 GGG) and 14 had the opposite (10 BBG and 4 GGB). Pretty even split it seems. And one family had GG and then BG twins so didn't know where to put them. Also, two BBB families eventually had a girl.

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