ADOPTION. Arabic Tabanni تبني.
An adopted son, or daughter, of known descent, has no right to inherit from his or her, adoptive parents and their relatives, – the filiation of this description being neither recommended nor recognised by Muslim law. Such son or daughter is, however, entitled to what may be given under a valid deed in gift or will. In this particular the Muhammadan agrees with the English, and the Hindu with the Roman law. (Tagore Law Lectures, 1873, p.124.)
Based on Hughes, Dictionary of Islam