Plane is related to Seat. Wheelchair is a type of Seat. you are likely to find Wheelchair in/at/on Hospital. Hospital is related to Facility. 
Stake is related to Stick. you are likely to find Stick in/at/on Grass. Grass is related to Corn. 
Plane <--RelatedTo--> Seat <--IsA-- Wheelchair --AtLocation--> Hospital <--RelatedTo--> Facility 
Stake <--RelatedTo--> Stick --AtLocation--> Grass <--RelatedTo--> Corn 