Puberty Has Hit My Niece Hard. She's Taking It Out on My More Fortunate Daughter.
Briefly

"It's frustrating that your sister isn't taking steps to address her child's behavior, but it's still important to tell (and show) her what's going on."
"Bullying can be very damaging to kids, and in this case, your daughter is probably also feeling confused and betrayed..."
"It's worth telling your sister that you want to avoid a rift... she should want to do her part to try to avoid estrangement, too!"
Read at Slate Magazine
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