Squeak-
No, Odds of twins are 1 in 90 so single births are more common. Wednesday night she had two sisters and one brother, when she woke up Thursday morning she had two brothers and two sisters.
For the answer to have been twin boys the scenario would have to have been that my oldest daughter had four sisters and two brothers. While this is possible it is not the most likely scenario.
(By the way, I took your advice and didn’t tell my supervisor “in confidence” that my wife was expecting. As you may recall from the FLT thread I’m busy at work training in some people to try and fill in for me for the days that I’ll be out. I’m also busy preparing a speech for the bris but afterwards I’ll bli neder continue with the proof.)