secure in the knowledge that one has backing

conceited or arrogant by relying on a perceived advantage

to rely on; to depend on

To be inordinately proud of one's talent and contemptuous of others.

to rely on or depend on something, typically a specific advantage, power, or resource

father and mother (classical usage)

to use one's strength or power to mistreat or intimidate the weak

to lose one's mother

trustworthy or reliable; can be depended on