Catholic is a type of Christian. Christian is related to Minister. Minister is related to Church. you are likely to find Electricity in/at/on Church. 
you are likely to find Gate in/at/on Backyard. you are likely to find Wagon in/at/on Backyard. Wagon is related to Trailer. 
Catholic --IsA--> Christian <--RelatedTo--> Minister <--RelatedTo--> Church <--AtLocation-- Electricity 
Gate --AtLocation--> Backyard <--AtLocation-- Wagon <--RelatedTo--> Trailer 