Parent Lineage
Union Peak: 11,491' WY 991' Rise
| Depth | Parent | Elevation | Saddle | Prominence | State |
| 1 | Three Waters Mountain | 11,700' | 10,980' | 720' | WY |
| 2 | Shale Mountain | 12,404' | 12,073' | 331' | WY |
| 3 | Downs Mountain | 13,356' | 11,778' | 1,578' | WY |
| 4 | Flagstone Peak | 13,445' | 12,619' | 826' | WY |
| 5 | Bastion Peak | 13,490' | 12,735' | 755' | WY |
| 6 | Gannett Peak | 13,811' | 6,732' | 7,079' | WY |
| 7 | Longs Peak | 14,259' | 11,312' | 2,947' | CO |
| 8 | Torreys Peak | 14,272' | 13,723' | 549' | CO |
| 9 | Grays Peak | 14,275' | 11,493' | 2,782' | CO |
| 10 | Lincoln, Mount | 14,293' | 10,433' | 3,860' | CO |
| 11 | Massive, Mount | 14,427' | 12,444' | 1,983' | CO |
| 12 | Elbert, Mount | 14,438' | 5,346' | 9,092' | CO |
| 13 | Whitney, Mount | 14,494' | 4,415' | 10,079' | CA |
Green = More Prominent Parent
Immediate Children:
| # | Child | Elevation | Prominence | State |
| 1 | 10940 | 10,940' | 360' | WY |
| 2 | 10785 | 10,785' | 645' | WY |
| 3 | 10340 | 10,340' | 320' | WY |
| 4 | 9532 | 9,532' | 322' | WY |
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