[bromanchik]

Originally posted by CordeliaS
My sister is planning on pretending the child is biologically hers. Is this harmful if the child never finds out... I don't think so... right? I'm only scared that someday my niece might find out she is adopted, and will think her parents lied to her. Any adivce would be greatly appreciated!

It is harmful. And the child will find out. If your sister decides not to tell her daughter she will be lying to her, in the worst way. Your sister's lie is all about her and her needs not about what her daughter needs.