Trunk is a different concept from Branch. Branch is related to Range. Range is related to Land. Land is related to Urban. 
Brother is related to Man. Man is related to Cave. 
Trunk <--DistinctFrom--> Branch <--RelatedTo--> Range <--RelatedTo--> Land <--RelatedTo--> Urban 
Brother <--RelatedTo--> Man <--RelatedTo--> Cave 