parent-child relationship
Refers to the relationship between parent and child, including biological, legal, and emotional bonds.
The parent-child relationship is the foundation of the family.
He is struggling with his parent-child relationship.
親子 means 'parent and child' as a pair, while 親子関係 specifically refers to the relationship between them.
家族関係 is a broader term for family relationships, including siblings and extended family, whereas 親子関係 is limited to the parent-child bond.
Compound of 親子 (parent and child) and 関係 (relationship).