Parent Lineage
Union, Mount: 7,979' AZ 2,949' Rise
| Depth | Parent | Elevation | Saddle | Prominence | State |
| 1 | Bill Williams Mountain | 9,256' | 6,950' | 2,306' | AZ |
| 2 | Sitgreaves Mountain | 9,389' | 7,430' | 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 | 14,438' | 5,346' | 9,092' | CO |
| 16 | Whitney, Mount | 14,494' | 4,415' | 10,079' | CA |
Green = More Prominent Parent
Immediate Children:
| # | Child | Elevation | Prominence | State |
| 1 | Woodchute Mountain | 7,860' | 2,930' | AZ |
| 2 | Davis, Mount | 7,900' | 280' | AZ |
| 3 | Tritle, Mount | 7,782' | 586' | AZ |
| 4 | Moscow Peak | 7,721' | 181' | AZ |
| 5 | Spruce Mountain | 7,696' | 716' | AZ |
| 6 | Towers Mountain | 7,631' | 1,994' | AZ |
| 7 | 7300 | 7,300' | 280' | AZ |
| 8 | Eugene Ridge | 7,145' | 165' | AZ |
| 9 | Big Bug Mesa | 7,140' | 240' | AZ |
| 10 | Yankee Doodle Peak | 7,060' | 40' | AZ |
| 11 | Elliott, Mount | 6,980' | 280' | AZ |
| 12 | 6962 | 6,962' | 622' | AZ |
| 13 | Pine Mountain | 6,780' | 560' | AZ |
| 14 | 6700 | 6,700' | 320' | AZ |
| 15 | 6545 | 6,545' | 285' | AZ |
| 16 | Little Mesa | 6,502' | 362' | AZ |
| 17 | Brady Butte | 6,402' | 862' | AZ |
| 18 | 6149 | 6,149' | 329' | AZ |
| 19 | 6100 | 6,100' | 280' | AZ |
| 20 | Spud Mountain | 5,544' | 404' | AZ |
| 21 | 5302 | 5,302' | 402' | AZ |
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