Many records make no distinctions between full and half-siblings. Is it possible that siblings you think are full siblings are half-siblings and someone was married before or had a previous relationship?
And there's always the chance that people referred to as siblings are actually step-siblings.
It is interesting that you mention this. I recently found a census record in which my great great grandfather had passed away but his son from his first marriage was living with the gggfather's 2nd wife and she was listed as the mother even though she was in fact the step mother.
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