2009

Take, for example, the asymmetrical hierarchy of dummy helper objects shown
below:
Hierarchy in viewport (numbers added)
Hierarchy in Select From Scene dialog
From the viewport image, it might appear that Dummy objects 06, 08 and 02
are siblings of each other. However, the setup is actually more complicated,
because Dummy objects 02 and 08 are direct children of Dummy03, while
Dummy06 is a direct child of Dummy05, which has the same hierarchical
level as Dummy03:
■ Selecting Dummy06 and activating Select Sibling - Next results in
Dummy08 being selected.
■ Selecting Dummy06 and activating Select Sibling - Previous results in
Dummy02 being selected.
■ With Dummy02 selected, activating either Select Sibling command results
in Dummy08 being selected, and the selection continues alternating for
each subsequent invocation of either command. This is because 3ds Max
looks only as far as the next branch above the selected object, resulting in
Dummies 02 and 08 being siblings of Dummy06, but not vice-versa.
Hierarchies | 3353