Cell is related to House. you are likely to find Brother in/at/on House. Brother is related to Relation. 
Back is related to Rest. Rest is a synonym of Support. Root is a type of Support. 
Cell <--RelatedTo--> House <--AtLocation-- Brother <--RelatedTo--> Relation 
Back <--RelatedTo--> Rest <--Synonym--> Support <--IsA-- Root 