How many kids could you have before your partner realised none looked like him?

There's nothing wrong with your partner, he's got a good job, plenty of money, tall, good looking, pretty much everything you want from a man. But if you want lots of kids it's best not to put all your eggs in one basket, you've got to sprinkle a little extra genetic material into the mix.

The problem is guys don't understand this and some get a little stroppy when a baby pops out and it's the wrong colour or doesn't have his nose.

But how observant is your partner? How diverse could your brood be before he got suspicious?
How many kids could you have before your partner realised none looked like him?
How many kids could you have before your partner realised none looked like him?
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