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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I don't think it's ever worked for me that I can recall. I had a sim living in a house with this trait AND she had the fertility trait AND I got her a fertility massage and still no multiples. I wanted triplets so bad because I've never had them. Alas, I gave up and the went on to have 4 singleton births.
