Goat is part of Tribe. Horn is part of Goat. Horn can be used for Entertainment. 
you are likely to find Sink in/at/on House. you are likely to find Glass in/at/on Sink. Glass is related to Unit. Unit is related to Parish. 
Tribe <--PartOf-- Goat <--PartOf-- Horn --UsedFor--> Entertainment 
House <--AtLocation-- Sink <--AtLocation-- Glass <--RelatedTo--> Unit <--RelatedTo--> Parish 