Retirement is a type of Withdrawal. Withdrawal is a type of Separation. Separation is related to Split. 
Unit is related to Household. Household is related to Fly. Balloon can be used for Fly. Balloon is related to Blow. 
Retirement --IsA--> Withdrawal --IsA--> Separation <--RelatedTo--> Split 
Unit <--RelatedTo--> Household <--RelatedTo--> Fly <--UsedFor-- Balloon <--RelatedTo--> Blow 