Definition of kid brother:
°Son of the same parents as another person.
"My parents love me and my younger brother equally."
°To treat as a brother.
"1819, Seest thou not we are overreached, and that our proposed mode of communicating with our friends without has been disconcerted by this same motley gentleman thou art so fond to brother? -- Walter Scott, Ivanhoe"
Definition of kid brother:
°Son of the same parents as another person.
"My parents love me and my younger brother equally."
°To treat as a brother.
"1819, Seest thou not we are overreached, and that our proposed mode of communicating with our friends without has been disconcerted by this same motley gentleman thou art so fond to brother? -- Walter Scott, Ivanhoe"