helping someone grow up to be an accepted member of the community

your foster brother is a male who is not a son of your parents but who is raised by your parents

Of or relating to human society and its modes of organization, Interacting with other people and living in communities, the science of all that relates to the social condition, the relations and institutions which are involved in man's existence and his well-being as a member of an organized community; sociology. It concerns itself with questions of the public health, education, labor, punishment of crime, reformation of criminals, and the like, noun_ A festive gathering to foster introductions, a party of people assembled to promote sociability and communal activity, US Short for social security number

having or fostering a warm or friendly and informal atmosphere, Not in accord with the usual regulations; unofficial, Characterized by nontechnical vocabulary, simple sentence structure, and relatively few explicit transitions, as typified by spoken language