A husband and wife report conflict over parenting styles. The therapist observes that whenever the topic arises, the wife looks to her mother (who lives with them) for validation. This most likely reflects a:
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A
Coalition between wife and mother against the husband
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B
Triangulation involving the mother as a stabilizing third party
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C
Disengaged boundary between the couple and extended family
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D
Horizontal stressor affecting the nuclear family