Comment is a type of Explain. Person wants (to) Explain. you are likely to find Person in/at/on Family. Family is related to Other. 
Recession is related to Economy. Economist is derived from Economy. 
Comment --IsA--> Explain <--Desires-- Person --AtLocation--> Family <--RelatedTo--> Other 
Recession <--RelatedTo--> Economy <--DerivedFrom-- Economist 