Senior is a synonym of Elderly. Elderly is related to Grandmother. Grandmother is the opposite of Grandchild. Grandchild is the opposite of Grandfather. 
Love is related to Passion. 
Senior <--Synonym--> Elderly <--RelatedTo--> Grandmother <--Antonym--> Grandchild <--Antonym--> Grandfather 
Love <--RelatedTo--> Passion 