Mental harassment by wife

My brother is married one month i.e 30 November 2017 and his wife went to her rented flat in dwarka on 31st December 2017, her mayka is in tundla. She always asks money to him. Always cursing her MIL for not giving lots of chadawa(sarees and jewellery). She always says she has been lived 10 years alone for her job so she can live without her husband. My brother’s in laws are always call my brother and says you cannot command my daughter to do anything she is independent she is not a puppet. But my brother is not like that he never conmands her nor my mother. My bhabhi talks with her good friend for very long hours when my brother asks her why you talk so much with him. Then she says she has taken loan from him 1 lac.. give me dat money i will never talked to him . When she had to come back after 15 days from her parents place den she denies to come back from dwarka flat and says my brother is acting like Detective.. she will take time and not coming back My brother’s in law calls my brother and threatens him dat act properly with their daughter otherwise they have proofs against him. My brother is in very confusing situation. Kindly tell me what he can do