Defining Attachments to Sibling Components

Attachments can be further classified by whether they attach the defining component to its parent or to a sibling component. Sibling attachments connect a component to one of its siblings. All of the previous examples have shown parent attachments.
Sibling attachments can often simplify a set of attachments by making it visually easier to interpret the attachment logic. In addition, this type of attachment sometimes results in fewer attachments.
a, b, and c should all follow the right side of their common parent. This can be accomplished by attaching all regions to the parent directly, but using sibling attachments is easier to understand.
Attachment examples
If the right side of the parent grows to the right, all of the sibling regions move to the right as well.
Attachment examples
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