Parent Plus is a Blender add-on from Nikita Akimov that adds a small set of tools for working with object parenting. It focuses on selecting parent–child hierarchy chains and on parenting groups of objects, with everything reached from a Parent+ tab in the 3D Viewport's N-panel.
Selecting a chain is handled by two commands. Select All Parents, mapped to Ctrl+[, selects the full chain of parents for the selected object, while Select All Children, mapped to Ctrl+], selects all of its children. Multiselect is supported. A separate Parent Selection To Empty button creates an Empty and parents all selected objects to it, and you can place that Empty at the 3D cursor, the center of the scene, the center of the selected objects, or the active object's location.
The add-on lists support for Blender 2.81, 2.82, 2.83 and 2.9, ships at version 1.0.0 under the GPL license, and includes documentation. A demo video is available. For current licensing and compatibility, check the developer's page.