Contributors to FamilySearch Family Tree, particularly those that are new to it, often hesitate to make changes for fear of “messing things …
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It's one thing to delete a person, and another to uncouple a person from an incorrect relationship. The policy as it stands makes it mandatory that incorrect relationships stand and impossible to correction them..
Please see these Help Center articles for correcting incorrect relationships:
How do I correct parent-child relationships in Family Tree?
A person in Family Tree has the wrong spouse