I had two sets of twins in the second generation of one family back to back boys and girls, then not another till the fourth. I am now on the fifth and no twins yet. I have all five families going on one computer, all five have had a set of twins at least once some twice, and Sunday I got my first set Triplets in a 5th gen family that had not had twins since the first generation... make it even more strange, I started three families on another laptop and first try with one got triplets, go figure. FYI, Baby boost only increases the odd's of a birth not twins or trips.
GL,
LauraLee