Parenting
Together with offset and delay, parenting helps define relationships between elements. Parenting links one object's properties to another object, establishing a direct connection. In the example, the child element's size and position depend on the parent's position.
As users interact with a parent element, their child elements should move accordingly. For example, when users swipe through an image carousel, images should move along with the slider and scroll.
From Lesson
12 Principles of Motion Design