Pennine Alps is the second Alpine main range after Mont Blanc Range. Most of the Alpine 4000ers are there.
Mattertal deserves Matterhorn group, Weisshorn group, Monterosa group, Mischabels group.
Parents refers to a larger category under which an object falls. For example, theAconcagua mountain page has the 'Aconcagua Group' and the 'Seven Summits' asparents and is a parent itself to many routes, photos, and Trip Reports.