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This child has been through a lot, I'm assuming. She certainly has a good command of manipulation. I'm raising a very challenging child who also comes from a traumatic background. She has tried to triangulate (set up conflicts between two out of three people in the triangle) many times, but my husband and I are a united front.
This little one needs a united front. She's currently getting away with this stuff and is learning from that that manipulation will get you what you want. The writer's husband should wake up and small the coffee. He and his wife need marriage counselling pronto and I hope to god the counsellor lets him know that he needs to be taking his wife's side and trusting her.
Once he becomes the primary caregiver by himself, instead of the wife, then the little one will spend her venom on him instead. Read up on Reactive Attachment Disorder and find out some fun facts.