The Parent-Child constraint creates a parent-to-child relationship between any two objects, from any two hierarchies. It creates the same relationship as the parent-to-child relationships found in hierarchies.

Parent-Child constraint

Use this constraint to connect objects without changing hierarchies or making hard connections. For example, in the following figure, a model’s hand effector is parented to a child-object sphere. Once the constraint is activated, any movement of the parent “hand” also occurs for the “ball” child in this way you can connect an object to the hand of a model without changing the model’s hierarchy.

A. Parent/Child constraint before activation B. Parent/Child constraint after activation

It does not matter if the objects in the Parent/Child relationship are in different hierarchies.

You can also use the Story window to activate and disable scheduled Parent/Child constraints.

Normal Parent/Child connections are globally active.