Dear is related to Father. Dad is a type of Father. Dad is related to Husband. 
Board is related to Floor. you are likely to find Dust in/at/on Floor. the first thing you do when you Clean is Dust. Clean is related to Spray. 
Dear <--RelatedTo--> Father <--IsA-- Dad <--RelatedTo--> Husband 
Board <--RelatedTo--> Floor <--AtLocation-- Dust <--HasFirstSubevent-- Clean <--RelatedTo--> Spray 