Relationship Skills are: 

"The ability to establish and maintain healthy and rewarding relationships with diverse individuals and groups. This includes communicating clearly, listening actively, cooperating, resisting inappropriate social pressure, negotiating conflict constructively, and seeking and offering help when needed."

From: https://betterkids.education/social-emotional-learning#what-is-social-emotional-learning

Relationship Skills Abilities are

• Listening actively, communicating effectively, and self-advocating

• Developing mutually healthy and productive relationships

• Making and maintaining trusting, respectful friendships

• Demonstrating gratitude

• Demonstrating cultural humility and competence

• Practicing collaborative problem-solving focused on the common good

• Attending to harm or conflict through restorative practices

• Resisting negative social pressure

• Showing leadership and contributing productively in groups

• Standing up for the rights of others

From: https://www.cde.ca.gov/ci/se/tselrelationshipskills.asp