Our expert says:
She has NO POWER except for what the pair of you choose to give her. Maybe it's not surprising that people dont't want to live with her. Don't let her blackmail you into fearing that she may say something unpleasant to other people if she's put in her place - she's probably saying unpleasant things already. Keep changing your son's cell number so she cannot call him on her own - that's not appropriate ! What you are describing is effectively child abuse, by her, a very selfish woman.
Sounds like the cancer is the least malignant part of her FIL's comment is exactly right. But maybe she's chosing to obsess about this child rather than pay appropriate attention to her own health.
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