From Longman Dictionary of Contemporary Englishsibling rivalrysibling rivalryMPcompetition between brothers and sisters for their parents’ attention or love → sibling
Examples from the Corpus
sibling rivalry• In real life, positive and negative oedipal relations, and guilt about these relations often remain hidden behind sibling rivalry.• Others continue the hostility into adulthood and never make peace with their brothers and sisters - a phenomenon called sibling rivalry.• Fearing that in comparison to them he can not win his parents' love and esteem is what inflames sibling rivalry.• They felt no sibling rivalry where Joe was concerned.• A bad case of sibling rivalry, it seems.• This was not the only instance of sibling rivalry in the house of Pelops.• This rejection fear compounds the anxiety that others are preferred and also maybe preferable-the root of sibling rivalry. 