What other explanation can there be if a child (already tested and positive) looks nothing like you?

My friend broke up with his girlfriend a couple years ago. However, they have a 4 year-old son. Though the son looks absolutely nothing like him at all, not even the skin tone. They're like water and oil. He looks nothing like the mother either.

He has already done the paternity on two different clinics and both results are 99.99 positive. Ok so it is his child after all. Yeah he does spends quality time with his kid. What other explanation can there be?

What other explanation can there be if a child (already tested and positive) looks nothing like you?
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