1. The disowning has no legal effect and by this means a person can not deprive a heir from succession of ancestral proeprty.
2. Similarly such disowning does not guarantee any protection from legal proceedings.
3. So if you do not want that girl to visit or meet you, it is fine. But do not cause any problem to your brother from leading a normal life with his wife.
4. Do note that even if the girl does not come to your house, still she can name you in the FIR if the case is at all filed by her in future.
5. So behave normally so this marriage succeeds.