When I first started playing VV1 I decided to ignore all matters of inter-family mating. It was just too difficult, maybe impossible, to keep track. I was pleased to see the addition of the parents' names and pictures in a child's details for VV2, although it didn't matter that much to me.
I know that lots of players enjoy making geneological charts of their villagers, but that's not for me.
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To err is human; to arr is pirate.