If you put birthday candles on the cake before you put it in the fridge it stops them eating it. Also you can add 'Lot Traits' to the house lot to increase you chance of twins.
Is there a copy of the rule set she's using? There are a few different variants I think.Also how has Abby played the sims and not known about the gnomes? Weird.I like the series tho - it's nice low impact like Alex and Truckin'
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