Parent Lineage
Union, Mount: 7,982' AZ 2,945' Rise
| Depth | Parent | Elevation | Saddle | Prominence | State |
| 1 | Bill Williams Mountain | 9,261' | 6,940' | 2,321' | AZ |
| 2 | Sitgreaves Mountain | 9,393' | 7,434' | 1,959' | AZ |
| 3 | Humphreys Peak | 12,634' | 6,580' | 6,054' | AZ |
| 4 | Banded Peak | 12,783' | 11,473' | 1,310' | CO |
| 5 | 12819 | 12,819' | 12,098' | 721' | CO |
| 6 | 12894 | 12,894' | 11,308' | 1,586' | CO |
| 7 | Summit Peak | 13,304' | 10,567' | 2,737' | CO |
| 8 | Rio Grande Pyramid | 13,825' | 11,913' | 1,912' | CO |
| 9 | Jagged Mountain | 13,833' | 12,861' | 972' | CO |
| 10 | Sunlight Peak | 14,061' | 13,649' | 412' | CO |
| 11 | Windom Peak | 14,089' | 11,923' | 2,166' | CO |
| 12 | Uncompahgre Peak | 14,318' | 10,069' | 4,249' | CO |
| 13 | Harvard, Mount | 14,424' | 12,074' | 2,350' | CO |
| 14 | Massive, Mount | 14,427' | 12,444' | 1,983' | CO |
| 15 | Elbert, Mount | 14,439' | 5,346' | 9,093' | CO |
| 16 | Whitney, Mount | 14,500' | 4,423' | 10,077' | CA |
Green = More Prominent Parent
Immediate Children:
| # | Child | Elevation | Prominence | State |
| 1 | Woodchute Mountain | 7,840' | 2,915' | AZ |
| 2 | Davis, Mount | 7,906' | 306' | AZ |
| 3 | Tritle, Mount | 7,782' | 586' | AZ |
| 4 | Moscow Peak | 7,721' | 181' | AZ |
| 5 | Towers Mountain | 7,631' | 1,994' | AZ |
| 6 | Yankee Doodle Peak | 7,060' | 40' | AZ |
| 7 | Pine Mountain | 6,780' | 560' | AZ |
| 8 | 6700 | 6,700' | 320' | AZ |
| 9 | 6550 | 6,550' | 301' | AZ |
| 10 | Little Mesa | 6,502' | 362' | AZ |
| 11 | Brady Butte | 6,402' | 862' | AZ |
| 12 | 6149 | 6,149' | 329' | AZ |
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