Parent is a type of Ancestor. Parent is a type of Organism. Organism is part of Ecosystem. Animal is part of Ecosystem. 
Cake is related to Soft. Soft is related to Sound. 
Ancestor <--IsA-- Parent --IsA--> Organism --PartOf--> Ecosystem <--PartOf-- Animal 
Cake <--RelatedTo--> Soft <--RelatedTo--> Sound 