Fighting is the opposite of Peace. Peace is the opposite of Conflict. Conflict is a synonym of Disagree. 
Mother is related to Girl. Girl is related to Kid. Kid is related to Boy. 
Fighting <--Antonym--> Peace <--Antonym--> Conflict <--Synonym--> Disagree 
Mother <--RelatedTo--> Girl <--RelatedTo--> Kid <--RelatedTo--> Boy 