1) Not sure on what basis you were disqualified from a government job as the case proceedings is still ON and there is no conviction or penalties against you. Even if there was a conviction you can always appeal in higher courts
2) In our legal experience we are yet to come across a case/judgment where the brother and his wife is convicted or penalized under 498A.
3) If the Police have not filed a charge sheet yet, you can approach the high court under section 482 of Cr.P.C and request the high court for quash of proceedings and stay of arrest which i am sure the High court will grant the quash and stay of proceedings.
4) If you have been disqualified from a government job because of mere filing of 498A, you can always approach the Central Administrative Tribunal and
4a. get reinstatement orders &
4b. along with back dated wages &
4c. Continuity of services without interruption,
Hope this information is useful.