Quote:
I've come to the conclusion that there is no advantage of having 6 kids other than the full house trophy.

The only other advantages I can think of are

1. that you get a wider choice when it's time to pick who is to inherit the house;
2. with more kids they are likely to stay in the house longer. It's more fun watching the kids run about than the teens or just the mother and father alone in the house.
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To err is human; to arr is pirate.