"Relational aggression" refers to hurtful behavior aimed at damaging a person's relationships or social standing, such as spreading rumors, excluding someone, or manipulating others to turn against them. Full definition
Some parents themselves without even realizing it model mild forms of relational aggression with a spouse, other adults or family members in their lives. (the-positive-parenting-centre.com)
Attachment styles, coping with relational aggression in students. (scirp.org)
The psychological term is known as relational aggression: intentionally hurting another person through the relationship. (alysonschafer.com)