Realation to head changing from om one cenus to 10 years later

[Simon7]

Hope my title makes sense

In one census record I found, a person realation to head was a niece and 10 years later same people on census, the same person realation to head changed to a step daughter.

How and why does that happen

Any ideas

Thanks

 

[davelambert271]

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[duckweed]

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[Ladybird1300]

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[Simon7]

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