disown

v. t. [ imp. & p. p. Disowned p. pr. & vb. n. Disowning. ] 1. To refuse to own or acknowledge as belonging to one's self; to disavow or deny, as connected with one's self personally; as, a parent can hardly disown his child; an author will sometimes disown his writings. [ 1913 Webster ]

2. To refuse to acknowledge or allow; to deny. [ 1913 Webster ]

Then they, who brother's better claim disown,
Expel their parents, and usurp the throne. Dryden.

Syn. -- To disavow; disclaim; deny; abnegate; renounce; disallow. [ 1913 Webster ]

adj. having social connections repudiated.
Syn. -- repudiated. [ WordNet 1.5 +PJC ]

n. the refusal to acknowledge (something or somebody) as one's own.
Syn. -- disownment. [ WordNet 1.5 ]