https://www.online-python.com/6LDtZz7lMh

* Take all families with two children

* Take a subset where at least one child is a boy born on Tuesday

* Take a subset of the previous subset where all children are boys

* The share of the 2nd subset relative to the 1st subset is around 48%

Yeah, makes sense. I thought I saw someone say 1/3 which is what seemed impossible.