partner-contact/partner_multi_relation_parent/data/data.xml

<?xml version="1.0" encoding="UTF-8"?>
<odoo>
    <data>
        <record id="parent_relation_type" 
            model="res.partner.relation.type">
                <field name="name">Is contact of</field>
                <field name="name_inverse">Has contact</field>
                <field name="contact_type_left">p</field>
                <field name="contact_type_right">c</field>
                <field name="handle_invalid_onchange">restrict</field>
        </record>
    </data>
</odoo>