Does "on ley line" work for you?!
Ive had it with several different files and i ALWAYS (100% of the time in my experience) get a singleton!
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Worked for me big time in my save that I'm playing just for fun/experimenting with the new pack. Triplets off the bat followed by twins and then a singleton (cause I was maxed on sims by that point). My 100 baby challenge went the same....3 sets of twins in a row!
