Joy is related to Satisfaction. Satisfaction is related to Feeling. Feeling is related to Hope. 
Disaster is related to Relief. Relief is related to Volunteer. Volunteer is related to Decide. 
Joy <--RelatedTo--> Satisfaction <--RelatedTo--> Feeling <--RelatedTo--> Hope 
Disaster <--RelatedTo--> Relief <--RelatedTo--> Volunteer <--RelatedTo--> Decide 