No where does that say that he told them anythign untrue.
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For the children to think that a stranger was their mother there would have had to be lies told...
“According to the Facebook conversations, they regarded another woman as their mother,”
You’ve never hear the phrase “Step mother”? Don’t bother responding. BEcause you still wouldn’t have a point. To regard someone else as one’s mother is not synonymous with not knowing that she is not your birth mother. There is no evidence to make the point that you are implying exists.