Required is a form of Require. Required is related to Carbon. Carbon is related to Matter. Matter is a type of Consequence. 
Mother is a type of Care. Careful is derived from Care. Careful is related to Danger. 
Require <--FormOf-- Required <--RelatedTo--> Carbon <--RelatedTo--> Matter --IsA--> Consequence 
Mother --IsA--> Care <--DerivedFrom-- Careful <--RelatedTo--> Danger 